solve A common error in banking is to interchange two of the digits in an amount Prove that the difference between the correct amount and the amount with the two digits interchanged is always divisible by 9

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solve A common error in banking is to interchange two of the digits in an amount  Prove that the difference between the correct amount and the amount with the two digits interchanged is always divisible by 9

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Question: solve A common error in banking is to interchange two of the digits in an amount. Prove that the difference between the correct amount and

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