A symbol and number series is a sequence containing numbers, symbols, or both, where you must examine their positions and relationships to answer a question. The most common tasks ask which symbol is immediately before or after a number, how many elements satisfy a condition, or which pattern appears in the sequence.
These questions can look confusing at first because the characters seem random. But after solving many reasoning problems, one simple habit makes them much easier: read the sequence from left to right and check only the relationship the question asks for. Once you recognize patterns such as number → symbol → number or symbol → symbol → number, the solution becomes much faster.
Number and Symbol Series Analysis
In a number and symbol series, each character occupies a specific position. A sequence might contain digits such as 2, 5, and 8 together with symbols such as @, #, %, and &. The question then gives a condition involving neighboring elements.
For example, consider:
4 6 @ 2 & % 8 $ 7 + 1
Suppose the question asks how many symbols are immediately preceded and followed by numbers. The symbol @ qualifies because it has 6 before it and 2 after it. The symbol $ qualifies because it has 8 before it and 7 after it.
The key is not to search randomly. First identify every symbol, then inspect its immediate left and right neighbors. Prepp uses exactly this positional approach in its worked reasoning questions.
Step-by-step Symbol Check
The safest method is to break the question into small checks. First, identify what type of element the question asks about. It may ask for symbols, numbers, letters, or a combination.
Next, determine the required pattern. If the question says a symbol must be immediately preceded by a number and immediately followed by another number, the required pattern is:
Number → Symbol → Number
Now scan the sequence from left to right. For every symbol, check the character directly before it and directly after it. Ignore elements that do not meet both conditions.
This method prevents a common mistake: counting a symbol that satisfies only one side of the condition. Testbook uses the same three-position logic in its explanations of mixed-series questions.
Counting Matching Symbols
After identifying the required pattern, count only the elements that satisfy all conditions.
Consider:
4 6 @ 2 & % 8 $ 7 + 1 * £ 5 & 3 Ω 9 #
For the pattern Number → Symbol → Number, the matching symbols are:
| Symbol | Before | After | Match? |
| @ | 6 | 2 | Yes |
| & | 2 | % | No |
| % | & | 8 | No |
| $ | 8 | 7 | Yes |
| + | 7 | 1 | Yes |
| * | 1 | £ | No |
| £ | * | 5 | No |
| & | 5 | 3 | Yes |
| Ω | 3 | 9 | Yes |
Therefore, there are 5 matching symbols.
The important lesson is to count the qualifying elements, not every symbol appearing in the sequence. This exact style of positional counting appears in current Prepp reasoning questions.
Important Questions from Arrangement and Pattern
Symbol and number questions belong naturally to broader arrangement and pattern reasoning. The characters may appear random, but the question imposes a specific relationship that turns the sequence into a structured problem.
For example, a test may ask for a number immediately preceded by a symbol and followed by another number. The target pattern then becomes Symbol → Number → Number. Another question may reverse the condition and require Number → Symbol → Symbol.
The fastest approach is to translate the words into a short visual pattern before checking the sequence. Testbook places these questions under its Arrangement and Pattern and Mixed Series categories.
Detailed Solution
A detailed solution should explain why each qualifying element matches the condition. Simply giving the final number is less useful because one wrong interpretation of “immediately” can change the answer.
For example, if the required pattern is Symbol → Symbol → Number, inspect every pair of adjacent symbols and then check the number immediately after the second symbol.
In the sequence:
@ / 3 & 5 3 9 1 ? % 7
the pattern Symbol → Symbol → Number appears when two symbols occur consecutively and the next character is a number. Testbook uses this exact logic in a current RRB NTPC question and obtains three valid cases.
More Mixed Series Questions
Mixed-series questions can use several types of relationships. A question may ask how many symbols are followed by numbers, how many numbers are surrounded by symbols, or how many letters occur between particular elements.
For example:
2 * 3 & @ @ 6 4 $ @ 3
If the question asks for numbers immediately followed by a symbol, inspect each number and look only one position to the right. Do not count a number simply because a symbol appears somewhere later in the sequence.
The word immediately is the most important clue. It means the neighboring character must satisfy the condition with no element between them.
More Arrangement and Pattern Questions
Arrangement questions often combine numbers, symbols, and letters. The difficulty comes from having to maintain several categories in your head while moving through the sequence.
A useful technique is to mark each element mentally:
N = number
S = symbol
L = letter
Then a sequence such as:
A 5 @ 7 B # 3
can be viewed as:
L N S N L S N
This makes a condition much easier to recognize. For example, a question asking for a symbol immediately preceded by a number and followed by a number is looking for N S N.
More Logical Reasoning Questions
The same symbol-and-number skills appear in broader logical reasoning tests. Competitive examinations may ask candidates to count elements, identify positions, remove one category, or compare neighboring characters.
A strong solver avoids unnecessary calculations. The problem is usually classification and position, not arithmetic.
Testbook’s related questions include tasks involving symbols, numbers, letters, preceding elements, following elements, and removal of specific categories.
TestUstad also places letter, symbol, and number series within analytical and logical reasoning and explains that mixed sequences can require pattern recognition, alternating rules, differences, reversals, or other hidden relationships.
Letter, Symbol and Number Series MCQs: common questions
A broader series can contain all three categories:
letters + numbers + symbols
For example:
A 4 # B 7 @ C 2 % D 9
A question may ask:
- How many symbols follow numbers?
- Which number is preceded by a letter?
- How many symbols are between two numbers?
- Which element is immediately followed by a number?
- How many letters are surrounded by numbers?
The correct strategy remains the same: identify the target category, translate the condition into a short pattern, and scan the sequence systematically.
TestUstad currently provides a large practice bank for letter, symbol, and number series and gives explanations for its questions.
Common Symbol and Number Patterns
| Question wording | Pattern to find |
| Symbol preceded and followed by numbers | Number → Symbol → Number |
| Symbol preceded by symbol and followed by number | Symbol → Symbol → Number |
| Number preceded and followed by symbols | Symbol → Number → Symbol |
| Number preceded by symbol and followed by number | Symbol → Number → Number |
| Symbol preceded by number and followed by symbol | Number → Symbol → Symbol |
| Number preceded by letter and followed by symbol | Letter → Number → Symbol |
| Symbol preceded by letter and followed by number | Letter → Symbol → Number |
Converting the sentence into a three-element pattern is one of the most useful shortcuts in this topic. Instead of repeatedly rereading a long question, you know exactly what arrangement you are looking for.
Example: Number → Symbol → Number
Consider:
5 8 @ 3 7 # 4 6 % 9
The question asks: How many symbols are immediately preceded and followed by numbers?
Check each symbol:
@ has 8 before it and 3 after it, so it qualifies.
# has 7 before it and 4 after it, so it qualifies.
% has 6 before it and 9 after it, so it qualifies.
Therefore, the answer is 3.
Notice that no arithmetic was required. The entire problem was solved through classification and position.
Example: Symbol → Symbol → Number
Now consider:
4 @ # 7 2 $ % 5 8 & 9
Suppose the question asks how many symbols are immediately preceded by another symbol and immediately followed by a number.
Look for:
S → S → N
The sequence contains:
@ → # → 7
and:
$ → % → 5
Therefore, two symbols satisfy the required condition: # and %.
This is the exact style of logic used in current mixed-series reasoning questions. Testbook explicitly describes the required arrangement as Symbol – Symbol – Number for one of its questions.
Example: Symbol → Number → Symbol
Consider:
6 @ 4 # 7 $ 2 % 8
Suppose the question asks for numbers immediately preceded and followed by symbols.
The required pattern is:
Symbol → Number → Symbol
Check:
@ → 4 → #
This qualifies.
# → 7 → $
This qualifies.
$ → 2 → %
This qualifies.
Therefore, there are 3 qualifying numbers.
Writing the required three-element pattern before scanning makes these questions much easier.
How to Solve Symbol and Number Questions Faster
First, read the question completely. Words such as immediately, only, not, preceded, and followed can change the required pattern.
Second, translate the condition into three letters:
N = number
S = symbol
L = letter
Third, scan from left to right. Do not repeatedly jump around the sequence because this increases the chance of missing an element.
Finally, count only after checking both sides of every possible candidate.
With practice, this process becomes almost automatic. The goal is not to memorize dozens of tricks. It is to develop the habit of translating language into a positional pattern.
Conclusion
A symbol and number series question tests your ability to recognize positions and relationships inside a sequence. The fastest approach is to identify the required element, convert the wording into a short pattern such as Number → Symbol → Number, and then scan the series from left to right.
The most important word is often “immediately.” It means the required element must be directly next to the other element, with nothing between them.
Whether the question uses numbers, symbols, letters, or all three, the same method works: identify, translate, check, and count. With regular practice, these questions become much quicker and far less confusing.
FAQ Section
What is a symbol and number series?
A symbol and number series is a sequence containing numbers and symbols arranged in a particular order. Reasoning questions ask you to identify elements based on their positions and neighboring elements.
How do you solve number and symbol series questions?
Read the condition, convert it into a short pattern such as Number → Symbol → Number, and scan the sequence from left to right.
What does “immediately preceded” mean?
It means the required element appears directly before the target element, with no other character between them.
What does “immediately followed” mean?
It means the required element appears directly after the target element, again with no character between them.
What is the easiest shortcut for symbol and number series?
Convert the question into a three-element pattern. For example, “symbol preceded by a number and followed by a number” becomes Number → Symbol → Number.
Can letters appear in a symbol and number series?
Yes. Mixed reasoning sequences can contain letters, numbers, and symbols together. TestUstad specifically categorizes these as letter, symbol, and number series.
Why should I count from left to right?
Many competitive-exam questions explicitly instruct candidates to count from left to right. Following that direction makes positional checking consistent and reduces mistakes.
What is a mixed series?
A mixed series combines different element types, such as letters, numbers, and symbols. The question may require you to identify a hidden pattern or a specific relationship between neighboring elements.
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