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From (4) apples and (5) mangoes, in how many ways can (1) apple and (2) mangoes be selected?

Answer and explanation

Correct answer: (40)

The apple selection and mango selection are independent, so count them separately and multiply. One apple can be selected from 4 apples in \(\binom41=4\) ways. Two mangoes can be selected from 5 mangoes in \(\binom52=\frac{5\times4}{2\times1}=10\) ways. By the multiplication principle, the total is \(4\times10=40\).

This is a combination question because only the selected fruits matter; the order in which they are chosen does not matter. For example, choosing mango X and then mango Y is the same selection as choosing Y and then X, so permutations must not be used. Therefore the number of possible selections is 40, which is option C.

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CombinationsClass11Easy

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