Multiple Choice Questions on In a club there are 6 boys and 4 girls Four children are selected Number of ways that there is at le........... for CDS Exam Preparation

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Multiple Choice Questions

In a club there are 6 boys and 4 girls Four children are selected Number of ways that there is at le...........

Quantitative Aptitude (CDS) Permutation & Combination
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    In a club, there are 6 boys and 4 girls. Four children are selected. Number of ways that there is at least one girl? 

    50

    Incorrect Answer

    60

    Correct Answer

    64

    Incorrect Answer

    58

    Incorrect Answer
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    Explanation:

    6 boys and 4 girls
    At least one girl
    6C3 x 4C1+6C2 x 4C2 +6C1 x 4C3+6C0 x 4C4
    6! /3! 3!  +6! /4! 2!    +6! /5!   ×4! /3! +1×1
    =6×5×4/3×2  +6×5/2   +6 ×4 +1
    =   20    +15+25
    =60

    By: bhavesh kumar singh
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