MS Excel
To create a formula, you first:

Select the cell you want to place the formula into
Choose the new command from the file menu
Type the equals sign (=) to tell Excel that you’re about to enter a formula
Enter the formula using any input values and the appropriate mathematical operators that make up your formula

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MS Excel
How do you select an entire column?

Select Edit > Select > Column from the menu
Hold down the Ctrl key as you click anywhere in the column
Hold down the shift key as you click anywhere in the column
Click the column heading letter

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