ECAT Engineering Exams Quizzes MCQs Quizzes ECAT Engineering Entry Test 2017 Mathematics Permutations, Combinations and Probability

Question:
n(n-1)/3.2.1 =

Option A):
3!(n-2)!/n!
Option B):
n!
Option C):
n!/3!(n-2)!
Option D):
(n-2)!/3!n!

Correct Answer is Option C):
n!/3!(n-2)!