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Discussion

  1. The number 58129745812974 is divisible by
    1. 11
    2. 9
    3. 4
    4. None of these.
  1. Correct Option: A

    We know that, a number is divisible by 11 when the sum of the difference between the sum of its digit at even places and sum of its digit at odd places is either 0 or the difference is divisible by 11.

    So number is 58129745812974
    Sum of digit at odd places = 4 + 9 + 1 + 5 + 7 + 2 + 8 = 36
    Sum of digit at even places = 7 + 2 + 8 + 4 + 9 + 1 + 5 = 36
    So, required difference = 36 - 36 = 0
    ∴ number is divisible by 11.

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