I would pick 1/2, 'at least 2' means the p(2)+p(3)
Draw a tree diagram you will see.
In three tosses of a fair coin, what is the probability of getting at least 2 heads? (A fair coin is equally likely to come up heads or tails.)
Is the answer 3/8, 5/8, 7/8, or 1/2? how do you go about solving this? (I came up with 3/8).