Multiple Choice Questions on If l m n 9 and l2 m2 n2 31 then the value of lm mn nl will be ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If l m n 9 and l2 m2 n2 31 then the value of lm mn nl will be ........

Quantitative Aptitude (CGL) Algebra
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    If l + m + n = 9 and l2 + m2 + n2 = 31, then the value of lm + mn + nl will be

    22

    Incorrect Answer

    50

    Incorrect Answer

    25

    Correct Answer

    -25

    Incorrect Answer
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    Explanation:

    (l + m + n)2= l2 + m2 + n2+2(l*m + m*n + n*l);
    Hence, lm + mn + nl = 92 – 31 = 50/2= 25

    By: MIRZA SADDAM HUSSAIN
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