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in MS excel all mathematical formulas are use with a+ or @ sign . for addition + ,for subtraction - , for multiplication  * and for division / and ^ for square . steps for entering the formula  :-
       1. click on the cell where you want to enter formula like B2 or C6 
        2. type formula  B2+C6 in formula box.
        3. press ENTER key you will get your result