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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.

4 / 9, 9 / 20, , 39 / 86

Option:
A. 17 / 40
B. 19 / 42
C. 20 / 45
D. 29 / 53
Answer: B . 19 / 42

Justification:

The sequence in the numerators is + 5, + 10, + 20,.... and that in the denominators is + 11, + 22, + 44,...
So, the numerator of the missing fraction should be (9 + 10)  i.e. 19 and the denominator shuld be (20 + 22)  i.e. 42.

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