Question 14601
P(both male) = 8/20 * 7/19 = 14/95


P(both female) = 12/20 * 11/19 = 33/95


P(one male and one female) is all the other possibilities, so if you are feeling secure in your maths skills, you can just say 1 - (14/95 + 33/95)

--> 1 - (47/95)
--> 48/95


Now, if you didn't know this, you would just have to work it out fully as:


P(first male then female) + P(first female then male)
(8/20 * 12/19) + (12/20 * 8/19)
24/95 + 24/95
48/95


jon.