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Arithmetic Progression

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Question

There are four post boxes in a locality. The number of ways in which a person can post five letters is

A

5!

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B

4!

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C

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D

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Solution

The correct option is D
One letter is posted in 4 ways
Two letters posted in $4^{2}$ ways
$⋮$ $⋮$
Five letters posted in $4^{5}$ ways

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