How many 7's are there

Question

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

Answer: Option D

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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