You order twelve burritos to go from a Mexican restaurant, seven with hot peppers and five without. However, the restaurant forgot to label them. You pick three burritos at random.
(a) In how many way you can pick all three burritos with hot pepper?
(b) In how many way you can pick one burrito with hot pepper and two without?
(c) In how many way you can pick at least one burrito with hot pepper and the rest without?