Multiple Choice Questions on a 1 a 6 then value of a 4 1 a 4 1 ........ for CDS Exam Preparation

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Multiple Choice Questions

a 1 a 6 then value of a 4 1 a 4 1 ........

Quantitative Aptitude (CDS) Simplification
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    a+1/a  =6 ,then value of a^4 +1/a^4 +1?

    1045

    Incorrect Answer

    1023

    Correct Answer

    1021

    Incorrect Answer

    1018

    Incorrect Answer
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    Explanation:

    a+ 1/a =6
    (a +1/a)^2 =6^2
    a^2 + 1/a^2 +2 =36
    a^2 + 1/a^2 =34
    squaring both side
    (a^2 + 1/a^2 )^2 =(34^2)
    a^4 + 1 /a^4 + 2=1024
    a^4 + 1 /a^4 =1022 
    a^4  + 1/a^4 +1=1023

    By: bhavesh kumar singh
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