Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number pair: 343 : 7, 243 : 9, 512 : 8, 216 : 6.
A343 : 7
B243 : 9 ✓ Correct
C512 : 8
D216 : 6
Correct answer: (B) 243 : 9 — 243 : 9 is the odd pair, so that is the answer.
Explanation
★243 : 9 is the odd pair, so that is the answer.
★In each pair the first number should be the cube of the second.
★7 cubed is 343, 8 cubed is 512 and 6 cubed is 216.
★So those three pairs join a cube with its cube root.
★9 cubed is 729, not 243, so 243 : 9 breaks the rule.
★So the odd pair is 243 : 9.
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