SOLUTION: A bag contains 18 blocks, 7 of which are red, 8 are blue, and the rest are green. If 7 blocks are selected randomly, determine the number of ways that at least 2 blocks of each co

Algebra ->  Permutations -> SOLUTION: A bag contains 18 blocks, 7 of which are red, 8 are blue, and the rest are green. If 7 blocks are selected randomly, determine the number of ways that at least 2 blocks of each co      Log On


   

Question 1111450: A bag contains 18 blocks, 7 of which are red, 8 are blue, and the rest are green. If 7 blocks are selected randomly, determine the number of ways that at least 2 blocks of each colour are included

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
R=7
B=8
G=3
Red=3 Blue=2 Green=2 That is 7C3*8C2*3C2=35*28*3=2940
Red=2 Blue=3 Green=2 That is 7C2*8C3*3C2=21*56*3=3528
Red=2 Blue=2 Green=3 That is 7C2*8C2*3C3=21*28*1=588
Sum is 7056