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Question

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


Solution

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

Mathematics
RD Sharma XI (2015)
Standard XI

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