Insert an AutoSum formula with the SUM function
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ALT+ - (minus sign)
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ALT+= (equal sign)
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ALT+ %
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ALT+ !
B
Correct answer
Explanation
ALT+= (or ALT++ on some keyboards) inserts the AutoSum SUM function that automatically selects the range above or to the left. The equal sign makes sense because formulas begin with =. This is faster than typing SUM() manually.