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have either a boy or a girl. If the family has four children, let X

denote the number of girls.

Determine the probability distribution of X. (Hint: There are

16 possible equally likely outcomes. One is GBBB, meaning

the first born is a girl and the next three born are boys.)

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i don't understand why there are 16 outcomes not 5.

there can be 0, 1, 2, 3, or 4 girls..