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Fundamental Principle of Counting

There are 8 d...

Question

There are 8 doors to a lecture room. The number of ways that a student can enter the room and leave it by a different door is 56.

A

True

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B

False

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Solution

The correct option is A True
A student can enter the room in 8 ways but he can leave the room in 7 ways.
The total number of ways in which this can be done = 8 $\times$ 7 = 56

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