# Answer to Question #17893 in C++ for Asma

Question #17893

Let n = ak ak-1 ak-2. . .a1 a0 be an integer and t = a0 - a1 + a2 - …+ (-1)k ak. It is known that n is divisible by 11 if and only if t is divisible by 11. For example, suppose that n = 8784204. Then, t = 4 - 0 + 2 - 4 + 8 - 7 + 8 = 11. Because 11 is divisible by 11, it follows that 8784204 is divisible by 11. If n =54063297, then t = 7 - 9 + 2 - 3 + 6 - 0 + 4 - 5 = 2. Because 2 is not divisible by 11 then n is not divisible by 11.

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