Multiple Choice Questions on The expansion x minus y 2 n ge 5 is done in the descending powers of x If the sum of the fifth and s........... for NDA Exam Preparation

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Multiple Choice Questions

The expansion x minus y 2 n ge 5 is done in the descending powers of x If the sum of the fifth and s...........

Mathematics (NDA) Arithmetic progression
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    The expansion (x−y)2,n≥5 is done in the descending powers of x. If the sum of the fifth and sixth terms is zero, then x/y is equal to

    \frac{n-5}{6}

    Incorrect Answer

    \frac{n-4}{6}

    Correct Answer

    \frac{5}{n-4}

    Incorrect Answer

    \frac{6}{n-5}

    Incorrect Answer
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    Explanation:

    nC 4 x n – 4 y 4 – nC 5 x n – 5 y 5 = 0
    =>nC 4 x n – 4 y 4 = nC 5 x n – 5 y 5
    => x/y =nC5/ nC4= (n -4)/5

    By: Munesh Kumari
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