Discussion
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: A
Correct answer: 2
Two 7s qualify: the one in 3 7 3, which is preceded by 3 and followed by 3, and the one in 2 7 3. The 7s in 5 7 2 and 5 7 3 are ruled out by the 5 before them, and the last 7 is followed by 8. So there are 2.
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