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Find the sum of all three-digit numbers that are not divisible by (9).

Answer and explanation

Correct answer: (439200)

The sum of all three-digit numbers is (494550), and the sum of multiples of (9) is (55350), so the answer is (439200). For not divisible, the complement method is fast.

Related tags

Not DivisibleComplement MethodApFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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