When you add each digit, it's always equals to 9 or a multiple of 9. Example 18 (1+8=9) , 27 (2+7=9)
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It is 3 6 9
Yes. It is the divisibility rule for 9.
If all the digits add up to 9 then it is divisable by 9
add all the digits together and see if it is divisible by nine.
2.50