SOLUTION: A classroom building has 7 different doors. In how many ways can a student enter by one door and exit by a different door?

SOLUTION: A classroom building has 7 different doors. In how many ways can a student enter by one door and exit by a different door?

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Question 523226: A classroom building has 7 different doors. In how many ways can a student enter by one door and exit by a different door?
Answer by deborabr(181) (Show Source): You can put this solution on YOUR website!
enter 7
exit 6
7*6=42 ways
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