There are four letter boxes in post office In how many ways can a man post 8 distinct letters ........

Quantitative Aptitude ( CCS) Permutation & Combination

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There are four letter boxes in post office. In how many ways can a man post 8 distinct letters?

4⁸

8⁴

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Explanation:

Assuming we can put any letter in any post box – even leaving one of more boxes empty – it’s easy. The first letter has four possible choices, the second letter also has four possible choices, and so on; continue until all eight letters are placed.
4⁸ = 65536 ways.