excel logical functions

1. AND checks whether all arguments are TRUE, 
 and returns TRUE if all arguments are TRUE
2. FALSE returns the logical value FALSE.  
3. IF checks whether a condition is met, and returns
 one value if TRUE, and another value if FALSE.
4. NOT changes FALSE to TRUE, or TRUE to FALSE.
5. OR checks whether any of the arguments are TRUE, 
 and returns TRUE or FALSE. Returns FALSE only if all 
 arguments are FALSE.
6. TRUE returns the logical value TRUE.