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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.

9, 11, 20, 31, (…….), 82

Option:
A. 41
B. 51
C. 60
D. 71
Answer: B . 51

Justification:

Each term in the series is the sum of the preceding two terms.
.'. Missing number =  20 + 31 = 51.

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