Multiple Choice Questions on If a b 1 and a3 b3 61 then the value of ab will be ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If a b 1 and a3 b3 61 then the value of ab will be ........

Quantitative Aptitude (CGL) Algebra
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    If a-b=1 and a3-b3 = 61, then the value of ab will be

    -20

    Incorrect Answer

    20

    Correct Answer

    30

    Incorrect Answer

    60

    Incorrect Answer
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    Explanation:

    (a-b)2 = a2+b2-2ab =1; ----eq.(i)
    (a3-b3)=(a-b)( a2+b2+ab) = a2+b2+ab =61;-------eq.(ii)
    Subtract eq.(i) from eq.(ii)-
    3ab = 60; =>ab=20

    By: MIRZA SADDAM HUSSAIN
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