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Fundamental Principle of Counting

There are 5 d...

Question

There are 5 doors to a lecture room. The number of ways that a student can enter the room and leave it by a different door is

A

20

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B

16

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C

19

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D

25

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Solution

The correct option is A 20
A student can enter the room in 5 ways but he can leave the room in 4 ways.
The total number of ways in which this can be done = 5 $\times$ 4 = 20

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