A 4-person grievance committee is to be selected out of 2 departments, A and B, with 18 and 23 people, respectively. In how many ways can the following committees to selected?

a. 3 from A and 1 from B.

b. 2 from A and 2 from B.

c. All from A.

d. 4 people regardless of department.

e. At least 3 from department A.

**Solution:-**

a. 18768

b. 38709

c. 3060

d. 101270

e. 21828