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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MS Excel
To create a formula, you can use:

Cell references but not values
Values or cell references although not both at the same time
Value and cell references
Values but not cell references

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