Hi I am having a real problem, Im sure its a simple one, but someone please help, Im copying a formula down from an above cell into lower cells however rather than changing the value in that cell to coincide with the formula it is just copying the value in the above cell for example, the formula in A3 is =Sum (A2*A1) Im then copying the formula (By left dragging the formula down) into cell B3 and C3 but rather than changing the number it still has the same one, when I put my mouse on the cell it shows the formula as =sum(B2*A2) but its not right Why


A1 A2 A3
1 10 10
2 20 10
5 60 10

Please help