Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number: 13, 53, 63, 23.
A13
B53
C63 ✓ Correct
D23
Correct answer: (C) 63 — 63 is the odd number, so that is the answer.
Explanation
★63 is the odd number, so that is the answer.
★Check whether each number is a prime number.
★13, 53 and 23 are all prime, having no factors other than 1 and themselves.
★63 is not prime, since it equals 7 times 9.
★So 63 differs from the three primes.
★So the odd number is 63.
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