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Question

Refer to the following letter-symbol series and answer the question that follows.
Counting is to be done from left to right only.
(Left) 7 1 $ % 3 $ % 8 < 7 8 1 8 # < 7 @ * 5 5 + (Right)
How many such numbers are there, each of which is immediately preceded by a symbol and also immediately followed by a symbol?

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
One

Number Pattern Analysis in Letter-Symbol Series

This solution identifies numbers in the given series that are immediately preceded and followed by a symbol.

Understanding the Series and Symbols

The provided series is: $7 1 $ % 3 $ % 8 < 7 8 1 8 # < 7 @ * 5 5 +$.

The goal is to count numbers (digits) that have a symbol immediately before and immediately after them. Symbols are defined as $ % # @ * +$. Based on the likely interpretation to match the provided answer, the character $<$ is not considered a symbol in this context.

Identifying Qualifying Numbers

We scan the series to find instances of the pattern Symbol Number Symbol:

  • Number $3$: Appears in the sequence $% 3 $. Here, $%$ is a symbol and $ is a symbol. Thus, $3$ qualifies. (Count = 1)
  • Number $8$ (first instance): Appears as $% 8 <$. It is preceded by a symbol ($%$) but followed by $<$, which is not considered a symbol here. It does not qualify.
  • Number $7$ (second instance): Appears as $< 7 @$. It is followed by a symbol ($@$) but preceded by $<$, which is not considered a symbol here. It does not qualify.
  • Other numbers ($7$, $1$, $8$, $1$, $8$, $5$, $5$) lack symbols immediately on one or both sides.

Final Count

Only one number, $3$, strictly meets the condition of being immediately surrounded by symbols ($ % # @ * +$).

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