Fine the odd one from the given options which is different from others.

Appeared in: NHM UP Staff Nurse-2021 Shift-2nd

Explanation

The number 210 is the correct answer because it is not a perfect square.
The other options, 144, 169, and 196, are all perfect squares.
The pattern observed is a sequence of squares of consecutive integers: 12² = 144, 13² = 169, and 14² = 196.

Option A: 144 is a perfect square (12 x 12) and fits the pattern established by the other numbers (except 210).
Option B: 169 is a perfect square (13 x 13) and fits the pattern of consecutive squares.
Option C: 196 is a perfect square (14 x 14) and continues the sequence of consecutive squares.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identifying the odd one out in a number series based on mathematical properties (perfect squares) as background academic context rather than a clinical decision trigger.
This type of logical reasoning question is common in the General Intelligence or Aptitude section of nursing entrance exams to assess problem-solving and analytical skills.
Strong analytical skills are essential for nurses for accurate clinical decision-making, interpreting patient data, and prioritizing care.
What if? - If the stem changed one defining clue so that 210 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 in the options.
Try to identify a common mathematical property or relationship among most of the numbers. Common patterns include squares, cubes, prime numbers, multiples of a certain number, or arithmetic/geometric progressions.
In this case, test if the numbers are perfect squares: √144 = 12, √169 = 13, √196 = 14.
Notice that 144, 169, and 196 are squares of consecutive integers (12, 13, 14).
Check the last number, 210. It is not a perfect square (since 14² = 196 and 15² = 225).
The number that does not share the common property is the 'odd one out'. Therefore, 210 is the answer.

Concept Tested & Keywords

Concept Tested: Identifying the odd one out in a number series based on mathematical properties (perfect squares).
Stem keywords: Find the odd one, different from others
Lead-in keywords: odd one

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Practise the full NHM UP Staff Nurse-2021 Shift-2nd

Attempt every question from this paper in a timed mock, then review the full solution for each one.