PP-T2-31

[max999]

31.
A certain basket contains 10 apples, 7 of which are red and 3 of which are green. If 3 different apples are to be selected at random from the basket, what is the probability that 2 of the apples selected will be red and 1 will be green?
Ans:式子怎麼列阿

[amyliang]

[C7,2 * C3,1]/ C10,3
不知道對了沒