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In Number sequece questions, you are given a long series of numbers. It is required to find out how many times a number satisfying conditions, specified in the questions, occurs.

How many 7's are there in the following series which are preceded by 6 which is not preceded by 8 ?
8  7  6  7  8  6  7  5  6  7  9  7  6  1  6  7  7  6  8  8  6  9  7  6  8  7

Option:
A. Nil
B. One
C. Two
D. Three
E. None of these
Answer: D . Three

Justification:

8  7  6  7  8  6  7  5  6  7  9  7  6  1  6  7  7  6  8  8  6  9  7  6  8  7

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