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Formulas and Functions: Microsoft by Paul McFedries

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5. Troubleshooting Formulas

Despite your best efforts, the odd error might appear in your formulas from time to time. These errors can be mathematical such as dividing by zero, or Excel might simply be incapable of interpreting the formula. In the latter case, problems can be caught while you’re entering the formula. For example, if you try to enter a formula that has unbalanced parentheses, Excel won’t accept the entry. Instead, it displays an error message instead. Other errors are more insidious. For example, your formula might appear to be working—that is, it returns ...

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