Please only solve part a.

Please write step by step solution with the correct calculation. Please make sure that you understand the question completely. You do not need to type. You can just scan the solution. Thank you.

An intensive care nurse has a bag with 5 green balls, U blue balls, and 4 red balls, (a) If she randomly selects 5 balls from her bag, what is the probability that she selects more blue balls than red balls? (b) Given that she selected 2 green balls from a selection of 5 balls, what is the probability that she selected more blue balls than red balls