Re: simplifying n factorials

1 + [tex] cos [tex] theta [tex] / 2

Re: simplifying n factorials

Quote:

Originally Posted by

**anil86** 1 + [tex] cos [tex] theta [tex] / 2

What on Earth?? Did you mean this to go into another thread or something?

-Dan

Re: simplifying n factorials

Quote:

Originally Posted by

**johntuan** wait for the 2nd step how did u get (n+1)n!??

It comes directly from the **definition** of "factorial". n! is defined as "n(n-1)(n-2)...(3)(2)(1)". That is "n times all positive integers less than n". (n+2)! is "n+ 2 times all positive integers less than n+ 2" or (n+2)(n+1)(n)(n-1(n-2)...(3)(2)(1)= (n+2)(n+1)(n!).