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Question
If a 3-digit number abc is divisible by 11, then ______ is either 0 or multiple of 11.
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Solution
If a 3-digit number abc is divisible by 11, then (a + c) – b is either 0 or multiple of 11.
Explanation:
Since, abc is divisible by 11, the difference of sum of its digits at odd places and that of even places is either zero or multiple of 11, i.e. (a + c) – b is either zero or multiple of 11.
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