
Mark M. answered 11/14/16
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If the sum of the digits is a multiple of 3, the number is a multiple of 3.
Using only 0, 2, and 5, this is true for 222, 225, 252, 522, 525, 552, and 555.


Mark M.
Yup, thanks for the notification!
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11/14/16
David W.
11/14/16