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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.

Count each 7 which is not immediately preceded by 5 but is immediately followed by either 2 or 3.
How many such 7's are there ?
5  7  2  6  5  7  3  8  3  7  3  2  5  7  2  7  3  4  8  2  6  7  8

Option:
A. 2
B. 3
C. 4
D. 5
Answer: A . 2

Justification:

5  7  2  6  5  7  3  8  3  7  3  2  5  7  2  7  3  4  8  2  6  7  8

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