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From (6) boys and (5) girls, in how many ways can (3) boys and (1) girl be selected?

Answer and explanation

Correct answer: (100)

The boys and girls form two separate groups, and the required selection must contain exactly three boys and exactly one girl. First choose the boys, then choose the girl. These choices are independent, so their numbers are multiplied. Since selection is involved and order is irrelevant, combinations are used.

The number of ways to choose three boys is \(\binom63=20\). The number of ways to choose one girl is \(\binom51=5\). Therefore the total is \(\binom63\binom51=20\times5=100\). The order in which the selected students are listed does not create a new group. Hence choice A, (100), is correct.

Related tags

CombinationsClass11Easy

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