SOLUTION: 1. There are 10 doors to a coliseum. In how many ways can a person go in and out if one can enter any door but leave using another door?
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Question 1191310: 1. There are 10 doors to a coliseum. In how many ways can a person go in and out if one can enter any door but leave using another door?
Answer by ikleyn(52780) (Show Source): You can put this solution on YOUR website!
.
There are 10*9 = 90 possible different outcomes:
to enter in any of 10 doors and to leave using any of 9 remaining doors.
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