In a large university statistics class it is know that 10% are 1st year, 25% are 2nd year, 40% are 3rd year, and 25% are 4th and special student. Assume that 10 students were randomly selected from this class. Find the probability that

A) 5 are 3rd year student. B) 2 are 1st year and 5 are 3rd year. C) 1 is 1st year, 3 are 2nd year, and 6 are 3rd year.