Question
If an 8-digit number 256139A4 is divisible by 11, find
the value of A.Solution
An 8-digit number 256139A4 is divisible by 11 if the difference between the sum of its digits at odd places and the sum of its digits at even places is either 0 or a multiple of 11. (2+6+3+A) -(5+1+9+4) A=8
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