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aivan3 [116]
3 years ago
7

Which rule can be used?

Mathematics
1 answer:
Svetradugi [14.3K]3 years ago
3 0
Thes first rule is correct. 

Another way of doing it is:

Sum the digits of the number. If the result is divisible into nine, then the original number itself will also be.

Example:

18 = 1+8 = 9. 9 is divisible into 9.

27 = 2+7 = 9. 9 is divisible into 9.

Wish you luck!
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