I need a formula for rowwise

[Excel function]

I need a formula for to calculate a total value of rowwise
example i find the value of A1+D1+g1

 

[yshridhar]

Try this
=SUMPRODUCT(--(MOD(COLUMN(A1:Z1),3)=1),A1:Z1)
best wishes
Sreedhar

 

[Gary''s Student]

In A2 enter:
=A1+D1+G1