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15 February, 16:34

The sum of the digits of a large number is 81. Using the divisibility rules, by which number or numbers is that large number divisible?

A. Only 3

B. 3 and 6

C. 3 and 9

D. 3, 6, and 9

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Answers (1)
  1. 15 February, 19:46
    0
    The sum of the digits is 81

    sum the digits again and get 9

    Therefore, as 9 is only divisible by 9 and 3 the answer is 'C'
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