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math challenge II-A Combinatorics Problem 6.9

 
 
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Re: math challenge II-A Combinatorics Problem 6.9
by John Lensmire - Friday, 24 September 2021, 1:28 PM
 

You are correct that the (-1)^3 comes from the -1/y in the y - 1/y. It is true that the constant term of $(y - 2/y)^6$ is $-160$.