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In how many can 5 letters be posted in 4 letter boxes?

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In how many can 5 letters be posted in 4 letter boxes?
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Correct Answer - `4^(5)`
Since each letter can be posted in anyone of the 4 letter boxes, so each letter can be posted in 4 ways.
So, the required number of ways `=(4xx4xx4xx4xx4)=4^(5)`.
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