Paper 1 · Mathematical Reasoning and Aptitude
Find the missing number in the following series: 2/3, 4/7, ?, 11/21, 16/31
A10/8
B6/10
C5/10
D7/13 ✓ Correct
Correct answer: (D) 7/13 — The missing fraction is 7/13, so that is the answer.
Explanation
★The missing fraction is 7/13, so that is the answer.
★Treat the numerators and the denominators as separate series.
★The numerators are 2, 4, ?, 11, 16, whose differences are 2, 3, 4, 5.
★So the missing numerator is 4 plus 3, which is 7.
★The denominators are 3, 7, ?, 21, 31, whose differences are 4, 6, 8, 10.
★So the missing denominator is 7 plus 6, which is 13, giving 7/13.
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