In the expansion of (x+y)^n the coefficient of x^4y^(n-4) is 3,876 and the coefficient of x^5y^(n-5) is 11,628. Find the coefficient of x^5y^(n-4) in the expansion of (x+y)^(n+1). What is the value of n?
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Each coefficient can be calculated as follows: (1) (2)
Combine (1) and (2):
Thank you so much Ridley! My only question is, what happened to the (n-4)! and (n-5)! when you combined (1) and (2)?
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