Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number: 51, 144, 64, 121.
A51 ✓ Correct
B144
C64
D121
Correct answer: (A) 51 — 51 is the odd number, so that is the answer.
Explanation
★51 is the odd number, so that is the answer.
★Check whether each number is a perfect square.
★144 is 12 squared, 64 is 8 squared and 121 is 11 squared.
★51 is not the square of any whole number.
★So 51 differs from the three perfect squares.
★So the odd number is 51.
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