If the number of couples having at least eight children in S is zero, then fin

Question

If the number of couples having at least eight children in S is zero, then find the number of couples in S having exactly seven children___

Options:

Answer: Option A
:

Exactly 7 = (more than 2 + less than 3) - (less than 7) = 21 + 31 - 47 = 5

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