Brothers and sisters | Mentor graphics interview

You and a friend are standing in front of two houses. In each house lives a family with two children.
“The family on the left has a boy who loves history, but their other child prefers math,” your friend tells you.
“The family on the right has a 7-year old boy, and they just had a new baby,” he explains.
“Does either family have a girl?” you ask.
“I’m not sure,” your friend says. “But pick the family that you think is more likely to have a girl. If they do have a girl, I’ll give you $100.”
Which family should you pick, or does it not matter?

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