Question
A group consists of 7 boys and 12 girls. In how many
ways can 3 boys and 5 girls be selected from the group?Solution
Required number of ways = 7 C 3 × 12 C 5
= (7! / (3! × 4!)) × (12! / (5! × 7!))
= 35 × 792 = 27,720
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