Multiple Choice Questions on If a b 2a ndash 3b ab then 3 5 5 3 is equal to ........ for DRDO Exam Preparation

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Multiple Choice Questions

If a b 2a ndash 3b ab then 3 5 5 3 is equal to ........

Quantitative Aptitude and Numerical Ability (DRDO) (Phase-i and II) Algebra
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    If a * b = 2a – 3b + ab, then 3 * 5 + 5 * 3 is equal to :

    21

    Incorrect Answer

    22

    Correct Answer

    23

    Incorrect Answer

    24

    Incorrect Answer
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    Explanation:

    a * b = 2a – 3b + ab
    Þ 3 * 5 = 2 × 3 – 3 × 5 + 3 × 5 = 6
    5 * 3 = 2 × 5 – 3 × 3 + 3 × 5
    = 10 – 9 + 15 = 16
    Therefore, 3 * 5  + 5 *3
    = 6 + 16 = 22

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