ELi5: How does anyone know whether or not Excel gives the right answers to the functions and equations entered?

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How can anyone know whether Excel is giving the right answer to anything that is more complex that one can do in one’s own head? I mean if I had to check every formula and function, I don’t need Excel, but couldn’t there be a bug that someone missed that returns an erroneous result in specific situations? That could be potentially catastrophic depending on what the data and results were used for.

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