This in Statistics and Probability about permutations. Solve the problem below. Provide clean and clear solutions thank you and Godbless.

II. Solve each of the following problems. Show your complete solution neatly and legibly on a separate sheet of paper. (20%) 21. Three CS students, four IT students, two ACT students and one engineering student are to be lined up. A) How many different arrangements of these students are there? B) How many different arrangements of these students are there if the students on the same course are to be grouped together? C) How many different arrangements of these students are there if the students on the same course are to be grouped together except the ACT students