if 25a215 is divisible by 3 ,then a can take the value of
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Divisibility rule of 3 is that the sum of all digits should be divisible by 3
Thus 2 + 5 + a + 2 + 1 + 5 = 15 = Div by 3
Value of a can be 0 , 3 , 6 or 9
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