It's still half. Right?

Probability Level 2

In a two-child family, it is known that at least one child is a boy. What is the probability that the other child is girl?


  • The two children are not twins.

  • Each child is either male or female.

  • Each child has the same chance of being male as of being female.

  • The sex of each child is independent of the sex of the other.


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