I have a HUGE spreadsheet and want to blank out certain cells based upon a
test to see if other cells are also blank. For example:

A B C
1 .5 3
2 .1 0
3 0
4 .3 1

It is easy enough to place an IF statement in column C to test to see if the
cells in column A are blank, which A3 is in this example. But what I want to
do is to use an IF statement (or something else) to write a blank over the
corresponding cell in column B if the cell in column A is also blank. Any
ideas?