Okay guys, this is pretty much my dumb down version of explaining some formal logic based on my knowledge. I believe this is something that needs to be really understood in order to improve in logic games.

Example 1:

If A-> Not B

If B-> Not A -------> That implies that

*A can be alone

*B can be alone

*Both can be absent ( BUT YOU CAN NOT HAVE BOTH A AND B SELECTED!)

Example 2:

If Not A -> B

If Not B ->A ----------> That implies that

*If A is out, then B is in

*If B is out, then A is in

*Or both A and B can be in

THEY BOTH CAN NEVER BE ABSENT!!

Example 3:

If not A ->not B

If B ->A ------------> That implies that

* Both CAN be absent

*Both CAN be present

*A CAN be by itself

* B CANNOT! I REPEAT CANNOT be Alone!!!

Excuse the caps, the emphasis helps me remember haha...Please make any changes if I am wrong. But this is what I came across. When I finally had this written down, it made so much more sense to me.