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

Explanation

The missing fraction is 7/13.

Numerators 2, 4, ?, 11, 16 rise by 2, 3, 4, 5.

So 4 + 3 = 7 gives the numerator.

Denominators 3, 7, ?, 21, 31 rise by 4, 6, 8, 10.

So 7 + 6 = 13 gives the denominator, making 7/13.

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