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3 child family.... probability that all three children are girls given that at least one of the kids is a girl?

P(E) = all 3 kids are girls. P(F) = at least one is a girl. Total # of outcomes: {GGG, GGB, BBB, BGG, BGB, GBG, GGB, BBG} 8 outcomes total. P(E) = {GGG} P(F) = {BBG,GBB,BGB,GGG} so I think I must use P(EintersectF)/ P(E).

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