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Excel's AI: 20% of the time, it works every time
(www.spacebar.news)
This is a most excellent place for technology news and articles.
Only when people use the wrong input, garbage in and garbage out.
In the same vein I can't think of any instance where excel had calculated things wrong unless there was a fault in the formula that I made.
Except if you're calculating dates from a long time ago. It famously takes some liberties with leap years.