Multiple Choice Questions on What percentage of numbers from 1 to 70 have 1 or 9 in the unit 39 s digit ........ for CDS Exam Preparation

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Multiple Choice Questions

What percentage of numbers from 1 to 70 have 1 or 9 in the unit 39 s digit ........

Quantitative Aptitude (CDS) Percentage
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    What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
     
     
    5%
     
    Incorrect Answer

    19%

    Incorrect Answer

     20%

    Correct Answer

    27%

    Incorrect Answer
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    Explanation:
    clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
     
    Number of such numbers =14
     
     Required percentage = (14/70×100 )% = 20%.

    By: bhavesh kumar singh
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