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Question

In how many ways can 7 letters be posted in 4 letter boxes?


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Solution

Given: There are 7 letters & 4 letter boxes.

Each letter can be posted in any one of the 4 letter boxes.

Number of ways of posting one letter =4

Required number of ways of posting the 7 letters

=4×4×4×4×4×4×4
=47

[By using the fundamental principleof Multiplication]

Hence, Required number of ways are 47.



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