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Question: how to write this equation in maple?

Question:how to write this equation in maple?

lin 15
sum
August 20 2013
1

here it is. sorry, at the top of the first sum, it's N1+N2 not N1+N1  :p    I tried many times, but can't succeed. the C is the combinasion, I also wrote it as

 

the fonction I wrote is like:

 

I couldn't understand the reason that it won't work.

 thanks a lot
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