Question 163

How many such 7s are there in the following number sequence each of which is immediately preceded by 5 and not immediately followed by 8?
2  3   5   7   8   9   3   4   5   7    6    1   9   3   5   7   4   8   3   2   5   7   8   8  9   2  5

Solution

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7's which are immediately preceded by 5 and not immediately followed by 8 : (5) (7) (not 8)

2  3   5   7   8   9   3   4   5   7    6    1   9   3   5   7   4   8   3   2   5   7   8   8  9   2  5

Thus, there are two such 7's.

=> Ans - (C)

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