I want to use two formulas in one line. The aim is to sum two columns, `A`

and `B`

, in `C`

with two conditions:

First, if cells in `A`

or `B`

are blank, then formula in column `C`

will return blank.

Second, if `B`

is greater than `A`

, then leave cell blank.

Both formula should be used in the same cell simultaneously.