Question : Out of every 100 jobs received at a computing center, 50 are of class1, 30 of class 2 and 20 from class 3

i) A sample of 30 jobs is taken without replacement. Find the probability that the sample will contain 10 jobs of each class.

ii) A sample of 3 jobs is taken with replacement, find the probability that there will be exactly 12 jobs of class 2