MS Excel
How do you delete a column?

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

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MS Excel
To create a formula, you can use:

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

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