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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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For class representatives, (4) boys and (5) girls are available. A president and a secretary are to be chosen, and the two posts must go to different persons. If the president must be a girl, in how many ways can it be done?

Answer and explanation

Correct answer: (40)

There are (5) choices for president and (8) remaining choices for secretary. When posts are different, order matters.

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics
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