Multiple Choice Questions on The expression 52n ndash 23n has a factor ........ for CDS Exam Preparation

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Multiple Choice Questions

The expression 52n ndash 23n has a factor ........

Quantitative Aptitude (CDS) Number System
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    The expression 52n – 23n has a factor?

    3

    Incorrect Answer

    7

    Incorrect Answer

    17

    Correct Answer

    None of the above

    Incorrect Answer
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    Explanation:

    52n – 23n = ( 52 )n – ( 23 )n = (25)n – (8)n
    We know that an – bn always have a common factor (a - b)
    Therefore one of the factor is 25 – 8 = 17

    By: Munesh Kumari
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