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5 terms

gmat

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How do you know if a number is divisible by 3?
sum of digits divisible by 3
how do you know if a number is divisble by four
last two digits are div by 4
how do you know if a number is divisible by six
even and divisble by three
how do you know if a number is divisbile by 9
sum of digits are divisible by 9
what is the work formula
(x*y)/(x+y)