Total B2 B3 B4 B5 The Excel Formula would look like this the cells are specified by row and column by typing or by clicking on them while in formula bar. In each linear series you add or subtract the same step value. Then divide by 2.
In cell A3 type the formula A1A2 and press Enter.
1 Adding up numbers quickly can be useful for estimation. In each linear series you add or subtract the same step value. A Sequence is a set of things usually numbers that are in order. 14.