Question

why do we need formula? what are the general rules while typing a formula​

Answer 1

Answer:

When referring to computer software, formulas are most often used in spreadsheet programs, such as Microsoft Excel. Using formulas in spreadsheets can allow you to quickly make calculations and get totals of multiple cells, rows, or columns in a spreadsheet. ... In this formula, SUM is the function of the formula.

The rule for writing chemical formula are Firstly, write the symbols with positive charge valency first. Secondly, write the valency of each atom on the top of its symbol. Thirdly, divide the valency number by their highest common factor ignore the positive or negative radicle. Interchange the valency of the radicle.