Being Divisibel by 3 and 31
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It is divisible by any of its factors which are: 1, 3, 31 and 93
If the rules for 2 and 3 work, the number is divisibale by 5.
3 - 31
It is divisible by any of its factors which are: 1, 3, 31 and 93
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