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8, 9, 8, 7, 10, 9, 6, 11, 10,(......), 12?

Aptitude Quizzes Mathematics Aptitude Test

Question:
8, 9, 8, 7, 10, 9, 6, 11, 10,(......), 12

Option A):
11
Option B):
5
Option C):
7
Option D):
8

Correct Answer is Option B):
5

Explanation:
The given sequence is a combination of three series: (I). 1st, 4th, 7th, 10th terms i.e. 8, 7, 6, (......) (II). 2nd, 5th,8t1,, 1 1th terms i.e. 9, 10, 11, 12,(......) (III). 3rd, 6th, 9th terms i.e.’ 8, 9, 10,(......) The pattern in (I) is - 1. So, missing number 6 - 1 = 5.