Qualification > Math

Math again urrrgghh

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nid404:
Show that (2n)!/n!=2n (1x3x5x....x(2n-1))

I don't even understand the answer....what's the stuff in the brackets supposed to mean?

Ghost Of Highbury:
baap re!

will try..:P

nid404:

--- Quote from: eddie_adi619 on September 20, 2009, 01:52:42 pm ---okk..got it...

first simplify this part..which u didnt understand..:P

(1x3x5x....x(2n-1))

1*3*5... = 1*2*3*4*5*6........
               ------------------- ------------------   =  n! / n!! = 1/n!
               2*4*6*8......

R.H.S ==>  2n / n!

= (2n)! / n!

--- End quote ---

didn't get it :(....what is n!!...n factorial factorial.....no no im confused nw

Ghost Of Highbury:
nono..sry..that was incorrect...will correct it




i read it in a pdf...and wiki....

nid404:
To show or rather prove this, can I use a value for n...is it ok

If I do using a value i get

it's like

for example I use n=6

then 12!/6!=2^6(1x3x5x7x9x11)which is all the odd no from 1 to (2n-11)

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