Multiple Choice Questions on a 1 a 2 3 then value of a 3 1 a 3 1 ........ for CDS Exam Preparation

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Multiple Choice Questions

a 1 a 2 3 then value of a 3 1 a 3 1 ........

Quantitative Aptitude (CDS) Simplification
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    a +1/a)^2 =3 then value of a^3 + 1/a^3 -1?

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    Explanation:

    (a +1/a)^2 =3
    (a +1 /a) =v3...  equation1
    (a +1/a)^2 =3
     a^2 + 1/a^2 +2 =3
     a^2 + 1/a^2 -1 =0... equation2
     a^3 + 1/a^3  =(a+ 1/a)(a^2 +1/a^2 -1)
     =(v3 )(0)
     =0
     a^3 + 1/a^3 -1=-1

    By: bhavesh kumar singh
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