OK long way around...
=if(or(A1=0,A1="",B1=0,B1=""),"",A1+B1)
I want C1 to display the total of A1+B1. Cell C1 is to be blank until numbers are entered. If I enter "0" in A1, THEN C1 will display a zero.
If I only place a zero in B1, THEN C1 will display a zero.
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