How many 3’s are there in the following sequence which is neither preceded by nor immediately followed by 9?
9 3 6 6 3 9 5 9 3 7 8 9 1 6 3 9 6 3 9

9 3 6 6 3 9 5 9 3 7 8 9 1 6 3 9 6 3 9
​According to given condition;

3 is neither preceded by nor immediately followed by 9,

After analyze of series , none of the the pairs.

Thus, the correct answer is (d).