Multiple Choice Questions on In a group of 7 boys and 4 girls Four children are selected The number of different ways they can be........... for CDS Exam Preparation

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Multiple Choice Questions

In a group of 7 boys and 4 girls Four children are selected The number of different ways they can be...........

Quantitative Aptitude (CDS) Permutation & Combination
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    In a group of 7 boys and 4 girls. Four children are selected. The number of different ways they can be selected such that at least one girl is there?

    285

    Incorrect Answer

    295

    Correct Answer

    298

    Incorrect Answer

    290

    Incorrect Answer
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    Explanation:

    7boys and 4girls

    (7C3 x 4C1) + (7C2 x 4C2)+(7C1 x 4C3)+7C0 x 4C4)

    (7×6×5/6   ×4! /3!) +(7×6/2  ×4! /4) +7×4+1

    =35×4+21×6+29

    =140+126+29

    =295

    By: bhavesh kumar singh
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