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Fundamental Principle of Counting

Count each 7 ...

Question

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

A

2

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B

3

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C

4

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D

5

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Solution

The correct option is A 2
5 7 2 6 5 7 3 8 3 7 3 2 5 7 2 7 3 4 8 2 6 7 8

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