2^4 =16 out comes

Ok I will list all the possibilities first (H=heads and T=tails.

HHHH

HHHT

HHTT

HTTT

TTTT So here we have all the possibilities, a total number of

TTTH (But wait... This is the same as the fourth one, so that's it!)

HHHH

HHHT

HHTT

HTTT

TTTT So here we have all the possibilities, a total number of

**5**TTTH (But wait... This is the same as the fourth one, so that's it!)

16

Well that depends, Are you going to toss all four coins at the same time or are you going to toss each one individually? If you toss all at the same time you'll get 4 different possible outcomes and if you toss one at a time you'll wind up with 8 possible outcomes.