On spreadsheets, a formula is an expression that tells how the numbers in a determined set of cells are to be calculated. 

Explanation:

Using formulas, you can instruction a spreadsheet program to perform mathematical operations on groups of numbers.  For example, you can instruct it to add, subtract, or average numbers in rows or columns.  Formulas (or a mix of letters, numbers, or symbols) are determined by the spreadsheet program and are part of its instructions.  The user can insert the formula into the formula bar (above) along with the cell addresses that need to be mathematically calculated.
 
 

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