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Hallo ,
I have columns A ,B, C. A and B have some formulas. so then it will show some values
Now in C column i write formula A+B ... but says Invalid Operation... Is it not possible add two columns which has formulas
Answers

The formula needs the full cell reference, which should include the column name plus the row number.
=[A]1 + [B]1
or use @row to make it easier to use the the formula within a column formula.
=A@row + B@row