Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number pair: 1 : 0, 3 : 8, 6 : 35, 7 : 50.
A1 : 0
B3 : 8
C6 : 35
D7 : 50 ✓ Correct
Correct answer: (D) 7 : 50 — 7 : 50 is the odd pair, so that is the answer.
Explanation
★7 : 50 is the odd pair, so that is the answer.
★In each pair the second number should be the square of the first minus 1.
★1 squared minus 1 is 0, 3 squared minus 1 is 8 and 6 squared minus 1 is 35.
★So those three pairs follow this rule.
★7 squared minus 1 is 48, not 50, so 7 : 50 breaks the rule.
★So the odd pair is 7 : 50.
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