My requirement is to use 3 types of output format with 10 possible cell
(input) values.

Example of the problem -

If cell value = "A" OR "B" OR "C", backcolor = Red
If cell value = "D" OR "E" OR "F" OR "G" OR "H" OR "I", backcolor = Green
If cell value = "J" OR "", backcolor = Yellow

I am aware of that VB programming can be done for this.
But I was thinking, if logical operators (e.g., AND, OR) can be used within
a conditional formatting, this problem can be solved very easily. (I tried by
myself, but could work it out.)

If anybody is aware of this, please let me know.