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Find the odd one out among the following numbers.
A181
B169
C121
D144
Answer & Solution
Correct answer: A. 181
1. Check each for being a perfect square: 169 = 13², 121 = 11², 144 = 12².
2. For 181, note 13² = 169 and 14² = 196, so 181 is not a perfect square.
3. Therefore 181 is the odd one out.
_Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.87._
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