Multiple Choice Questions on a b 1 ab 6 a 3 b 3 a b 2 simplify the equation ........ for CDS Exam Preparation

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Multiple Choice Questions

a b 1 ab 6 a 3 b 3 a b 2 simplify the equation ........

Quantitative Aptitude (CDS) Simplification
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    a-b=1, ab=6, (a^3 - b^3) +(a-b) ^2  simplify the equation ? 

    23

    Incorrect Answer

    32

    Incorrect Answer

    20

    Correct Answer

    22

    Incorrect Answer
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    Explanation:

    (a^3   -b^3) +(a-b) ^2
    =(a-b) (a^2  +b^2  +ab) +1^2
    =1(a-b) ^2+3ab+1
    =1+3×6+1
    =20

    By: bhavesh kumar singh
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