A teacher of a class wants to set 1 question from each of 2 exercises in a book. If there are 15 and 12 questions in the 2 exercises respectively. then in how many ways can the 2 questions be selected?

160

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140

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180

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120

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None of these

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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 is 15. Since the second exercise contains 12 questions, the number of ways of choosing the second question is 12. Hence, by the fundamental principle, 2 questions can be selected in $= 15 \times 12 = 180 w a y s .$

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