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Mathematics

Which of these numbers is not divisible by 9?

  1. 729

  2. 486

  3. 634

  4. 891

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Answer

A number is divisible by 9 if the sum of its digits is divisible by 9.

  1. 729 → 7 + 2 + 9 = 18 (divisible by 9)

  2. 486 → 4 + 8 + 6 = 18 (divisible by 9)

  3. 634 → 6 + 3 + 4 = 13 (not divisible by 9)

  4. 891 → 8 + 9 + 1 = 18 (divisible by 9)

Hence, option 3 is the correct option.

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