How many ways can 12 people be divided into three groups of 2, 7 and 3 in that order?
-
A.
7920 -
B.
792 -
C.
187 -
D.
42
Correct Answer: Option A
Explanation
= (frac{12!}{2! 3! 7!} )
(frac{12 times 11 times 10 times 9 times 8 times 7!}{2 times 3 times 2 times 7!})
= (7,920)