In a class there are 10 boys and 8 girls. The class teacher wants to select a student for monitor of the class.

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In a class there are 10 boys and 8 girls. The class teacher wants to select a student for monitor of the class. In how many ways the class teacher can make this selection ?


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Salim Ahmed Kawsar

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The teacher can select a student for monitor in two exclusive ways
(i) Select a boy among 10 boys, which can be done in 10 ways OR
(ii) Select a girl among 8 girls, which can be done in 8 ways. 

Hence, by the fundamental principle of addition, either a boy or a girl can be selected in 10 + 8 = 18 ways.

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