If three digits of a three digit number are a, B and C respectively, and (a + B + C) can be divisible by 9. Verification: the three digit number must be divisible by 9 thank

If these three numbers are a, B and C, then the value of three digits is 100A + 10B + C = 99A + 9b + (a + B + C), where 99A, 9b and (a + B + C) can be divided by 9, so this three digit must be divided by 9

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