When you see the #VALUE error, it means that there is something wrong with the way the formula is typed, or there is something wrong with the cells you are referencing.

Excel can solve for unknown variables, either for a single cell with Goal Seek or multiple cells with Solver.

To fix this issue, you should use the colon to separate the first cell from the last cell, for example, =SUM (A2:A3). The colon is used to separate when you refer to a continuous range of cells in ...