Give a quick stream of consciousness before answering the following question. Which of the following is equal to (x+2)!/x!?
Options:
(A) x-1
(B) 1+(1/x)
(C) 1
(D) x+1
(E) (x+1) (x+2)
(x + 1)! = (x + 1) (x+2)* x!
(x + 1)!/x! = (x + 1)(x+2)
The answer: (E).