Out of the given options, three are similar in a certain manner. However, one option is NOT like the other three. Select the option which is different from the rest.

1. A

   651

2. B

   441

3. C

   529

4. D

   729

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

• The correct option, 651, is the only number in the set that is not a perfect square.
• A perfect square is an integer that is the square of another integer.
• While the other three options (441, 529, 729) are perfect squares, 651 does not have an integer square root.

Why Other Options Were Wrong

• Option B: 441 is incorrect because it fits the pattern of being a perfect square (21²), which is common to two other options.
• Option C: 529 is incorrect because it also fits the pattern of being a perfect square (23²), similar to two other options.
• Option D: 729 is incorrect because it fits the pattern of being a perfect square (27²). Although it is also a perfect cube (9³), its primary shared characteristic in this set is being a perfect square.

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Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Odd One Out (Number Properties) as background academic context rather than a clinical decision trigger.
• This question tests logical reasoning and pattern recognition, which are general aptitude skills.
• There is no direct clinical relevance as this is a mathematics-based question, but analytical skills are crucial for nurses in interpreting data and making decisions.
• What if? - If the stem changed one defining clue so that 651 no longer matched, reassess the option whose mechanism, classification, or indication now fits the revised presentation.

How to Approach the Question

• First, carefully examine all the given numbers to understand their magnitude and potential relationships.
• Consider common mathematical properties: Are the numbers even or odd? Are they prime? Are they divisible by a common number? Are they perfect squares or cubes?
• Test each number for the identified property. In this case, check if each number is a perfect square.
• Identify the number that does not share the common property with the others. Here, 441, 529, and 729 are all perfect squares.
• The number that does not fit the pattern (651) is the correct answer.

Concept Tested & Keywords

• Concept Tested: Odd One Out (Number Properties)
• Stem keywords: odd one out, different from the rest, not like the other three
• Lead-in keywords: NOT
• Negative lead-in flag: The question asks to find the option that is NOT like the others.

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QVkI4Ze-ZnF70Jal0xgJur

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