All _ numbers whose digits sum upto multiples of _are divisible by 18
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Step-by-step explanation:
number that is divisible by 18 must be divisible by both 2 and 9.
The inverse is also true:
A number that is divisible by both 2 and 9 must be divisible by 18.
Therefore, we just have to test for both divisibility by 2 and 9.
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