Multiple Choice Questions on The product of two consecutive odd numbers is 399 Find the lower of them ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The product of two consecutive odd numbers is 399 Find the lower of them ........

Quantitative Aptitude (RRB NTPC) Number System
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    The product of two consecutive odd numbers is 399. Find the lower of them.

    17

    Incorrect Answer

    19

    Correct Answer

    21

    Incorrect Answer

    23

    Incorrect Answer
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    Explanation:
    Let the two consecutive numbers be x & (x+2)
    ∴ x(x+2)=399
    ⇒ x²+2x=399
    ⇒ x²+2x–399=0
    ⇒x²+21x–19x–399=0
    ⇒ x=19 x=21
    ∴ x=19

    By: Barka Mirza
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