How many 7โs 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
There are 3 such 7 preceeded byย which is not preceeded 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
Therefore, the correct option is option D.
ย
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