praetorian123 wrote:

1. Time yourself

2. Solve as fast as you can

3. Write your solution here, and your time please

16 men are divided equally into 4 groups, how many such groupings can be made?

a. 16C4 *12C4 * 8C4 *4C4

b. 1/4! * 16C4* 12C4*8C4 *4C4

c. 1/4! * 16P4 * 12P4 *8P4 *4P4

d. 1/24 * 16P4 * 12P4*8P4 * 4P4

e. 16/ 4!

halle. is correct.

had the groups been different from each other, A would have been the correct answer. but since the groups are indistinguishable , we have to divide A by 4! ...which gives us B.