Qualification > Math

Math again urrrgghh

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Ghost Of Highbury:

--- Quote from: nid404 on September 20, 2009, 02:33:46 pm ---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)




--- End quote ---

umm..nono...u cant do that....u have to simplify the LHS to get the RHS or vice versa...i'm still trying...

nid404:
gosh i need astar to do this

astarmathsandphysics:
I will answer this now. Have been writing maths notes all day.

astarmathsandphysics:

--- Quote from: nid404 on September 20, 2009, 01:12:12 pm ---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?

--- End quote ---
5!=5*4*3*2*1

Prover by induction
If n=1, so true for n=1. Suppose true for n=k. Prover true for n=k+1


Now we use that (2k)!/k!=2k (1x3x5x....x(2k-1))

nid404:
Thank you very much...I kinda got it but I need practice and some notes too

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