Cau1 : Benh bach tang do gen lan qui dinh . Bo' va me di hop sinh con . Tinh' xac suat sinh duoc 2 dua con sao cho vua` co be' gai' , vua co' be' trai va 1 bi benh 1 hok bi benh ? (nghia~ la con sinh ra phai co ca trai gai' va`co' 1 tinh trang benh ma hok can bik trai hay gai' benh)
Cau nay`...
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