Count each 7 which is not immediately preceded by 5 but is immediately followed by either 2 or 3.
How many such 7's are there ?
5 7 2 6 5 7 3 8 3 7 3 2 5 7 2 7 3 4 8 2 6 7 8
Answer : Option A
Explanation :
5 7 2 6 5 7 3 8 3 [7] 3 2 5 7 2 [7] 3 4 8 2 6 7 8