Question 249154
nCr = n!/((n-r)!r!) Combination of n things taken r at a time.
.
12C2 twelve frosh girls taken 2 at a time= 66 different combinations.
11C3 eleven frosh boys taken 3 at a time= 165 different combinations.
30C5 Thirty students taken 5 at a time=142506 different combinations.
.
(66*165)/142506
=.076
.
Ed