There are ten boys B 1 , B 2 , ...., B 10 and five girls G 1 , G 2 , ...., G 5 in a class. Then the number of ways of forming a group consisting of three boys and three girls, if both B 1 and B 2 together should not be the members of a group, is__________.
Text Solution
Verified by Experts1120
(1120)
n(b) = 10
n(a) = 5
The number of ways of forming a group of 3 girls of 3 boys.
= 10 C 3 x 5 C 3
The number of ways when two particular boys B 1 of B 2 be the member of group together
Number of ways when boys B 1 of B 2 hot in the same group together
= 1200x80=1120
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