MS Excel
The auto calculate feature

A and C
Automatically creates formulas and adds them to a worksheet
Can only add values in a range of cells
Provides a quick way to view the result of an arithmetic operation on a range of cells

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MS Excel
How do you delete a column?

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

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