Look at the following letter, symbol series and answer the question. Counting should be done from left to right only. (Left) 2 & @ 5 7 8 9 4 3 0 6 # 1 * 2 0 8 @ 7 (Right). How many such symbols are there each of which is immediately preceded by an odd number but not immediately followed by an even number?

1. A

   One

2. B

   Two

3. C

   None

4. D

   Three

Appeared in: DSSSB October 2024

Explanation

• The question asks for a specific pattern: Odd Number -> Symbol -> Not an Even Number.
• The series is: 2 & @ 5 7 8 9 4 3 0 6 # 1 * 2 0 8 @ 7.
• The symbol '*' is preceded by '1' (odd), but it is followed by '2' (even), which violates the second condition.
• All other symbols (&, @, #) are not preceded by an odd number.
• Therefore, no symbol in the series meets both required conditions, making the count zero.

Why Other Options Were Wrong

• Option A: It would be correct if one symbol met the criteria. The symbol '*' comes close but fails because it is followed by an even number ('2').
• Option B: It would be correct if two symbols in the series satisfied the conditions. A thorough check shows that no symbol satisfies both conditions.
• Option D: It would be correct if three symbols in the series satisfied the conditions. No symbol in the given series meets the criteria.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning: Symbol and Number Series Analysis as background academic context rather than a clinical decision trigger.
• This type of question is not directly related to clinical nursing practice.
• It is included in nursing entrance exams to assess logical reasoning, attention to detail, and the ability to follow complex instructions accurately.
• These cognitive skills are essential for nurses who must interpret data, follow protocols, and make sound judgments under pressure.

How to Approach the Question

• First, carefully read the question to understand the exact conditions. Break it down into simple rules. Here, the rules are: (1) Find a symbol, (2) Check if the character immediately before it is an odd number, (3) Check if the character immediately after it is NOT an even number.
• Scan the series to identify all the symbols: &, @, #, *.
• Systematically evaluate each symbol against the rules, one by one, from left to right.
• For the symbol '*', note that it meets the first condition (preceded by '1') but fails the second (followed by '2'). The question requires both conditions to be met.
• Keep a running count of the symbols that satisfy all conditions.
• After checking all symbols, the final count is the answer. In this case, the count is zero.

Concept Tested & Keywords

• Concept Tested: Logical Reasoning: Symbol and Number Series Analysis
• Stem keywords: letter, symbol series, preceded by, followed by, odd number, even number
• Lead-in keywords: How many

Question ID

QOf-tB5ViYSZsZ75XuF4iS

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