In a class there are 12 boys and 7 girls. The teacher wants to select a boy or a girl to represent a quiz competition. In how many ways can the teacher make this selection?

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Solution

The correct option is C 19
In the first choice, the teacher can select a boy among 12 boys in 12 ways (who ever may be of the 12 boys).
In the second choice, the teacher can select a girl among 7 girls in 7 ways (who ever may be of the 7 girls).

Hence, the teacher can select a boy or a girl to represent a quiz competition in 19 different ways (12 boys + 7 girls).

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