Multiple Choice Questions on If x 19 and y 18 then the value of x2 y2 xy x3 ndash y3 is ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If x 19 and y 18 then the value of x2 y2 xy x3 ndash y3 is ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If x = 19 and y = 18, then the value of x2 + y2 + xy/x3 – y3 is

    1

    Correct Answer

    37

    Incorrect Answer

    324

    Incorrect Answer

    361

    Incorrect Answer
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    Explanation:

    Expression = x2 + y2 + xy /x3 – y3
    =     (x2 + y2 + xy) /(x – y)(x2 + y2 + xy)
    = 1 /x - y
    = 1 /19- 18 = 1

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