Multiple Choice Questions on If a 1 a 2 3 then the value of a3 1 a3 ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If a 1 a 2 3 then the value of a3 1 a3 ........

Quantitative Aptitude (CGL) Algebra
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    If (a+1/a)2=3 then the value of a3+1/a3

    0

    Correct Answer

    (a+1/a)2

    Incorrect Answer

    3(a3+1/a3)

    Incorrect Answer

    1

    Incorrect Answer
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    Explanation:

    a + 1/a = √3;
    Squaring both side, we get-
    a2+ 1/a2 = 3-2 = 1;
     a3 + 1/a3 = (a + 1/a)(a2+ 1/a2 -1);
    = √3*0 = 0.

    By: MIRZA SADDAM HUSSAIN
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