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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Excel has been used worldwide for performing calculations since 1985. Thats many millions of users, in universities, accountancy firms and government department, performing and checking its functions over 37 years. I call that rigorous testing.
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