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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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On a library shelf, one Mathematics book and one Science book must be placed in order from (5) Mathematics and (4) Science books. If the first place is for Mathematics and the second for Science, how many arrangements are possible?

Answer and explanation

Correct answer: (20)

There are (5) choices for the first place and (4) for the second. For fixed-type positions, apply the multiplication rule directly.

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics
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