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October 4th, 2016, 08:52 AM  #1 
Senior Member Joined: Jul 2011 Posts: 405 Thanks: 16  sum containing binomial coefficients
Prove that prove that $\displaystyle\binom{2n}{n}>\frac{4n}{n+1}$ for all $n\geq 2$
Last edited by panky; October 4th, 2016 at 09:29 AM. 
October 4th, 2016, 06:33 PM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,834 Thanks: 650 Math Focus: Yet to find out. 
A proof of a proof eh.


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binomial, coefficients, sum 
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