Help pls! First correct answer will get brainliest and all guesses WILL be reported!!

Answer:
18.
a) 50%
b) 0%
c) 50%
19.
a) 0%
b) 0%
c) 100%
20.
a) 100%
b) 0%
c) 0%
21.
a) 0%
b) 50%
c) 50%
Explanation:
If you have any other questions like this, use punnet squares, they really help a lot.