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7th Class Mathematics Integers Question Bank Number And Ranking

  • question_answer
    If it is possible to make a number which is perfect square of  a two - digit odd number with the second, the sixth and the  ninth digits of the number 187642539, which of the following  is the digit in the unit's place of that two- digit odd number?                                            

    A) 1                          

    B) 7

    C) 9

    D) No such number can be made

    Correct Answer: B

    Solution :

    The 2nd, 6th and 9th digits of the number 1 8 7 6 4 2 5 3 9 are 8, 2 and 9 respectively. The perfect square of a two-digit odd number, formed using these digits, is 289 and \[289={{17}^{2}}\].


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