Math ECAT Exams Quizzes MCQs Quizzes Permutations, Combinations Probability Test

Question:
(n+2)(n+1)n=

Option A):
(n+2)!
Option B):
(n+2)!/ (n-1)!
Option C):
(n-1)!/(n+2)!
Option D):
n!

Correct Answer is Option B):
(n+2)!/ (n-1)!