<PRE><B>Question 913767</B>
12 students: 9B, 2H, 1(other)
3 chosen
P(no B) = {{{(3/12)(2/11)(1/10)}}}
......
30 children: 18B, 12G
3 chosen
P(all boys) = {{{(18/30)(17/29)(16/28)(15/27)(14/26)}}}
....
two dice are rolled
___1_2_3__4__5__6
1|_2_3_4__5__6__7
2|_3_4_5__6__7__8
3|_4_5_6__7__8__9
4|_5_6_7__8__9_10
5|_6_7_8__9_10_11
6|_7_8_9_10_11_12
P(sum = 8) = 5/36
............
5 cards chosen
P(2 Aces) = {{{(4C2)(48C3)/(52C5)}}} </PRE>