Multiple Choice Questions on If a ndash b 7 and a2 b2 53 find the value of ab ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If a ndash b 7 and a2 b2 53 find the value of ab ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If a – b = 7 and a2 + b2 = 53, find the value of ab.

    5

    Incorrect Answer

    3

    Incorrect Answer

    0.5

    Incorrect Answer

    2

    Correct Answer
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    Explanation:

    Explanation :
    2ab = (a2 + b2) – (a – b)2
    2ab = 53-49 =4
    ab =4/2 = 2

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