Summation in Excel -

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i want write formula in excel works follow, cannot handle despite numerous trials.
want make sum of 3 cells. of these cells may missing values (represented double dot ".."). formula has show sum of non-missing values. in particular, whether there @ least 1 non-missing value among 3 cells, result must sum of non-missing values. if there missing, result must missing ("..").

to sum can use:

=sumif(a1:c1,"<>..",a1:c1)

but if want .. in answer use:

=if(sumif(a1:c1,"<>..",a1:c1)=0,"..",sumif(a1:c1,"<>..",a1:c1))

edit : displaying 0 in answer if numbers 0 pointed out @jayvee in comment.

=if(and(sumif(a1:c1,"<>..",a1:c1)=0,countif(a1:c1,"<>..")=0),"..",sumif(a1:c1,"<>..",a1:c1))

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