In a student council, there are 8 first year students, 6 second year students, 5 third year students and 6 fourth grade students. 5 students will be randomly chosen as school representatives. All students have a equal chance of being a school representative.
A) What is the chance that 2 first year students and 1 student from each other grade become school representatives?
B) What is the chance that 3 second year students and 2 fourth year students become representatives?
The answer for A is $0.095$ and for B its $0.8056$ .
I thought to use combinations for choosing students and multiply the results, which in turn I would divide with the number of possible results as a whole, but it's giving me the wrong answers.