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If the number is even and

the sum of its digits is divisible by nine

then the number is divisible by 18.

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Q: What are the divisibility rules of 18?
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What divisibility rules were combined to make the divisibility rule of 36?

You have to use the rules of 4 and 9 Using the rules of 2 and 18 won't work because the smallest common multiple of 2 and 18 is 18 not 36. 3 and 12 won't work either because the smallest common multiple of 3 and 12 is 12 not 36. However 4 and 9 does work because their biggest common divisor is 1 so multiplying them works. The biggest common divisor of 2 and 18 is 2 and the biggest common divisor of 3 and 12 is 3


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bogo mo!