What is the significance of the ‘OF’ in X=SUM (OF a1-a4,
a6, a9);?

Answer Posted / prag s.

IF WE DON'T USE 'OF' THEN IT WOULD BE LIKE A1(MINUS)-A4. AND
THAT'S NOT WHAT WE ARE TRYING TO ACCOMPLISH. WE ARE TRYING
TO GET THE SUM OF THE VARIABLES A1-A4...

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