From what I understood from the (n+1)!=(n+1)n! example I would develop (2n)! like this: (2n)(n)(n-1)(n-2)...(3)(2)(1) but obviously it isn't the case?
Thank you very much for your help, I'm feeling I'm on the way of understanding!
First of all apologize for my english, I'm french and I'll do my best to be understandable.
So my question is about factorials.
how do you manage to say that (n+1)!=(n+1)n! ? I tried to develop this but my brain is just not able to understand how I'm suppose to do. Could someone please show...