MS Excel
Text formulas:

Replace cell references
Return ASCII values of characters
Show formula error value
Concatenate and manipulate text

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MS Excel
Rounding errors can occur

Because excel uses hidden decimal places in computation
When you show the results of formulas with different decimal places that the calculated results
When you use multiplication, division, or exponentiation in a formula
When you use addition and subtraction in a formula

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MS Excel
How do you delete a column?

Right click the column heading you want to delete and select delete from the shortcut menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Select the row heading you want to delete and select Edit>Delete from the menu
Select the column heading you want to delete and select Insert Delete from the menu

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