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OpenStudy (anonymous):
A number is divisible by 3 if and only if the sum of its digits is divisible by 3.
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OpenStudy (anonymous):
For example 15 is divisible by 3 and 1+5=6 is divisible by 3. What is another way to express a number abc that contains terms?
OpenStudy (zzr0ck3r):
there are many, exp. divisible by 5 iff last digit is a 0 or 5 there is a cool one for 11, look it up.
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