Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number pair: 13 : 21, 19 : 27, 15 : 23, 16 : 24.
A13 : 21
B19 : 27
C15 : 23
D16 : 24 ✓ Correct
Correct answer: (D) 16 : 24 — 16 : 24 is the odd pair, so that is the answer.
Explanation
★16 : 24 is the odd pair, so that is the answer.
★In each pair the second number is 8 more than the first.
★13 plus 8 is 21, 19 plus 8 is 27, 15 plus 8 is 23 and 16 plus 8 is 24.
★So the difference of 8 holds for every pair.
★But the first number is odd in 13 : 21, 19 : 27 and 15 : 23, while 16 is even.
★So the odd pair is 16 : 24.
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