Question: How many different strings of length 12 containing exactly five a's can be chosen over the following alphabets? (a) The alphabet {a, b} (b) The

How many different strings of length 12 containing exactly five a's

How many different strings of length 12 containing exactly five a's can be chosen over the following alphabets? (a) The alphabet {a, b} (b) The alphabet {a, b, c}

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