Multiple Choice Questions on Which of the following numbers will completely divide 12111 1 ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

Which of the following numbers will completely divide 12111 1 ........

Quantitative Aptitude ( CCS) Number System
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    Which of the following numbers will completely divide (12111-1)

    11

    Incorrect Answer

    4

    Correct Answer

     5

    Incorrect Answer

    7

    Incorrect Answer
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    Explanation:

    (xn-an) is completely divisible by (x+a) when n is even
    (12111-1)= (1122-1)
     (1122-122)

    Hence (12111-1) is completly divisible by(11+1)=12
    So ((12111-1) is also divisible by 4

    By: MIRZA SADDAM HUSSAIN
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