The third one is your answer! Think of it as all have to have a denominator of 10 with a real number two. Hope this helps!
The answer is 20 because all 4 sides would equal 5
The answer is B) 1/4.
There are 2 outcomes in his tree that have all coins with the same side up: HHH and TTT. There are 8 total outcomes. This makes the probability 2/8 = 1/4.
