write steps of divisibility test of 11
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for ex 22, 33, 44...............
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Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number . So, for instance, 2728 has alternating sum of digits 2-7+2-8 = -11. Since -11 is divisible by 11,so is 2728.
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