8, 9, 8, 7, 10, 9, 6, 11, 10, , 12 - Number Series - Series Completion - Verbal Reasoning question

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. - 8, 9, 8, 7, 10, 9, 6, 11, 10, , 12

A. 5

B. 7

C. 8

D. 11

E. None of the above

Answer: A. 5

The given sequence is a combination of three series :
I.   1st, 4th, 7th, 10th terms i.e. 8, 7, 6, (....)
II,   2nd, 5th, 8th, 11th term i.e. 9, 10, 11, 12.
III.   3rd, 6th, 9th term i.e. 8, 9, 10.
The pattern in I is - 1.
So, missing number = 6 - 1 = 5.

Posted in: Number Series - Series Completion - Verbal Reasoning