Question

In the series given below, count the number of 8s each of which is not preceded by 4 but is followed by either 1 or 6. How many such 8s are there? 0 8 1 5 4 8 6 7 6 8 6 1 4 8 1 8 6 3 7 1 5 8 7

A 1
B 3
C 5
D 7
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