Departments a, b, and c have 10 employees each, and department d has 20 employees. departments a, b, c, and d have no employees in common. a task force is to be formed by selecting 1 employee from each of departments a, b, and c and 2 employees from department d. how many different task forces are possible?

the answer is 10 task forces

Explanation:

A task force   is composed for

A=1

B=1

C=1

D=2

if we form 10 work groups, we must multiply by 10 each quantity of workers

A=1x10, B=1x10, C=1x10,D=2x10

A=10, B=10, C=10, D=20

This is the total number of employees in all departments

the entire statement is true and correct.  

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