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Change the digits around to deduce the correct sum

The first step is to deduce that the 9 must surely be the leftmost digit in the bottom line. Further analysis brings forth the following layout as the one...

The first step is to deduce that the 9 must surely be the leftmost digit in the bottom line. Further analysis brings forth the following layout as the one we are looking for:

PA

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This was first published in September 2008

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