doctor thinking

Dr. Johnson has two kids. One of them is a girl.

Assuming that the probability of each gender is ½, what is the probability that the other kid is also a girl?

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Answer:

The possible combinations of kids for this situation are Girl-Girl, Girl-Boy, Boy-Girl. We need the combination Girl-Girl, so there are three possible outcomes, and we need just one of them, therefore, the probability is 1/3.

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