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Mathematics
Trent Porter
7 June, 17:14
What is the divisibility of 11?
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Kelsey Manning
7 June, 17:45
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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.
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