How many 4's are there preceded by 7 but not followed by 3?
5 9 3 2 1 7 4 2 6 9 7 4 6 1 3 2 8 7 4 1 3 8 3 2 5 6 7 4 3 9 5 8 2 0 1 8 7 4 6 3
Answer: A
7 4 2
7 4 6
7 4 1
Only at these placees 4 is preceded by 7 but not followed by 3