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Write a 4-digit number abcd as 1000a+10...

Write a 4-digit number abcd as
1000a+100b+10c+d=(1001a+99b+c)-(a-b+c-d)If the number abcd is divisible by 11,then what can you say about [(b+d)-(a+c)]?.

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The correct Answer is:
divisible by 11
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