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OpenStudy (anonymous):
does 2157 divide by 3?
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OpenStudy (ivettef365):
let see 21/3 = 7 and 57/3 = 19 so it definitely divides by 3
OpenStudy (mathstudent55):
Add the digits of 2157 together. If the sum divides by 3, then 2157 divides by 3.
OpenStudy (anonymous):
Any number is divisible by 3 iff the sum of all the numbers is divisible Here 2+1+5+7=15 As 15 is divisible by 3 So the given number is also divisible by 3
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