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Learn Excel from MrExcel - Excel tips and tricks from Bill Jelen.
Learn Excel - Calc Bug Due to 17 Digits of Precision - Podcast 2110
Breaking news on a bad recalc bug in Excel. If you ever use RANK or Sort, you could be impacted. Fundamental belief: Excel stores 15 digits of precision. How RANK returns duplicates How RANK+COUNTIF eliminates duplicates Mystery where RANK+COUNTIF still returns a duplicate Four cells contain 1.15 =A2=A3 shows the cells are equal Ctrl+` shows the cells are equal But the four cells do not sort correctly. Something is different. Change the XLSX to a Zip file Open the XML inside the Zip File What? Excel is storing 17 digits!?! So - is that a good thing? More accurate, right? Maybe 16-digit credit card numbers stored as numbers, right? Hooray? But... while some functions only use 15 digits (COUNTIF and equality tests) others use 17 digits...

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