A teacher of a class wants to set one question each of two exercises in a book. If there are 15 and 12 questions in the two exercises respectively. In how many ways can the two questions selected?

160

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140

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180

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120

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Solution

The correct option is C 180

Since the first exercise contains 15 questions, the number of ways of choosing the first question in 15.

Since the second exercise contains 12 questions, the number of ways of choosing the second question is 12.

Hence, by the fundamental principle, two questions can be selected in $15 \times 12 = 180 w a y s .$

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