SOLUTION: This is an intro to probability chapter in a book called Applied mathmatics. The book is a combo of two diferent books especially made for my school. This is the problem: Find

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Question 149898: This is an intro to probability chapter in a book called Applied mathmatics. The book is a combo of two diferent books especially made for my school.
This is the problem:
Find (2n+2)!/(2n)!
I know how to do algebra, my problem I believe is because of the ! symbol. I have just been introduced to it and understand the concept , but not how it works in an agebraic expression.
Itried soving for n but don't know what to do with the !
ineed to understand the steps involved.
this is the answer:
4n2 +6n + 2
thanks in advance for any help.
heidi
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
The notation n%21 tells you to simply multiply that number by every integer that is less than that number until you hit 1. So if n=5, this means that 5%21=5%285-1%29%2A%285-2%29%2A%285-3%29%2A%285-4%29=5%284%29%283%29%282%29%281%29=120.


In this case,




which simplifies to

and



So


Photobucket - Video and Image Hosting Highlight the common terms.


Photobucket - Video and Image Hosting Cancel out the common terms.


Simplify.


FOIL %282n%2B2%29%282n%2B1%29 to get 4n%5E2%2B4n%2B2n%2B2=4n%5E2%2B6n%2B2