Hi Mark,
The inner workings of the INDEX and MATCH fuunctions are explained in Excel's Help file. FWIW:
• 1E+306 is a number expressed in scientific notation. It's actually the largest numnber Excel is capable of storing.
• MATCH(1E+306,Sheet1!A:A,1) tells Excel to use 1E+306 to find the highest numbered (ie last used) row in column A on Sheet1.
• INDEX(Sheet1!A:A,MATCH(1E+306,Sheet1!A:A,1)) tells Excel to return the value of the cell referenced by the MATCH function.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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