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In how many ways can 4 letters be posted in 3 letter boxes?

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In how many ways can 4 letters be posted in 3 letter boxes?
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Each letter can be posted in any of the 3 letter boxes. So, each letter can be posted in any of the 3 letter boxes.
So, each letter can be posted in 3 ways.
`therefore " 4 letters can be posted in " (3xx3xx3xx3)=3^(4)=81` ways.
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