Hello everyone!

I have been working on (or rather, looking at) this problem for hours on end, and I am still unable to complete it. For a textbook question, it seems quite difficult to me. What is wrong with me? Any help soon is greatly appreciated. Thank you in advance!

100 tickets are sold in a raffle in which there are 2 prizes. If you buy 5 tickets, what are the chances of you winning:

a.Both prizes?

b.Neither prize?

c.At least one prize?