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You can specify formula fields when you import data into your worksheet using the ImportTableOptions.IsFormulas. This property takes the Boolean array where the value true means the field is a formula field. For example, if the third field is a formula field, then the third value in the array will be true.
Please see the following sample code that explains how to specify the formula field while importing data to a worksheet. Please see the output Excel file generated by the code and the screenshot showing the effect of the code on the output Excel file.

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