Multiple Choice Questions on If P 3 1 P then the value of P4 1 P4 is ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If P 3 1 P then the value of P4 1 P4 is ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If P=3+1/P then the value of P4+1/P4 is

    81

    Incorrect Answer

    27

    Incorrect Answer

    120

    Incorrect Answer

    119

    Correct Answer
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    Explanation:

    p-1/p=3;
    Squaring both sides-
    P2+1/p2-2=9; => p2+1/p2=11;
    Square again of both sides-
    P4+1/p4+2=121; => p4+1/p4= 119

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