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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingHard
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One question is to be selected from each of four sections. The sections contain (7,8,6,5) questions respectively. Section one has (2) starred and section three has (3) starred questions, and both selected questions cannot be starred. How many valid papers are possible?

Answer and explanation

Correct answer: (1440)

Total choices are (7\times8\times6\times5=1680), and invalid choices are (2\times8\times3\times5=240). Subtract forbidden simultaneous selections from the total.

Related tags

Permutations-And-CombinationsFundamental-PrincipleCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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