1.

Find the number of ways in which one can post 5 letters in 7letterboxes.A. `7^(5)`B. `3^(5)`C. `5^(7)`D. 2520

Answer» Correct Answer - A
First letter can be put any 7 letters boxes = 7 ways
Similarly, 2nd, 3rd, 4th and 5th letters be put in 7 ways each, respectively
`:. 7 xx 7 xx 7 xx 7 xx 7 xx 7 - 7^(5)`


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