Question: Given an alphabet = {a, b, c}. How many strings of length 5 are in *, such that each string contains three a's, one b

Given an alphabet = {a, b, c}. How many strings of length 5 are in *, such that each string contains three a's, one b and one c?

Options:

60

20

36

12

PLEASE explain how you solved the problem, i.e. what principle/formula you used

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