what is the ? used for in a formula in excel?

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Can someone tell me what the "?" is used for in excel formulas? i.e
=IF(ISBLANK(G5),"",(SUM(F$5:F5)-SUM(G$5:G5))/SUM(F$5:F5))
Thanks.
 
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