How many combinations of a president, vice-president, secretary, and treasurer can be chosen from a group of 12 students?

A.)11,880
B.)95,040
C.)665,280
D.)3,991,680

Question

How many combinations of a president, vice-president, secretary, and treasurer can be chosen from a group of 12 students? 

A.)11,880
B.)95,040
C.)665,280
D.)3,991,680

raden · Answer

actually, this is a permutation problem. if n elements chosen r element becomes
nPr (here n =12 and r 4)

raden · Answer

so, what's 12P4 ?

raden · Answer

use the formula :
nPr = n!/(n-r)!

anonymous · Answer

Okay, but is it A, B, C, or D?

raden · Answer

can you evaluate the value of
12P4 = 12!/(12-4)! = 12!/8! = ...

anonymous · Answer

I just wanted the answer, but thanks anyways.

anonymous · Answer

D

raden · Answer

hmm. the admins OS must be angry to me, if i just give u the ansewer  :P
hehe.. try it

anonymous · Answer

I already got the answer from other people.

raden · Answer

nah, one more u have to know about the factorial :
n! = n(n-1)(n-2)(n-3)... 3.2.1

anonymous · Answer

I believe that it is D

anonymous · Answer

Like I said, I already got the answer from other people without doing any work.

anonymous · Answer

K

anonymous · Answer

I wasn't talking to you lol