find the 15th term in the expansion (1-t)^30

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- December 1st 2009, 04:30 PMTinhornFinding a particular term in a Binomial Expansion
find the 15th term in the expansion (1-t)^30

- December 1st 2009, 06:03 PMIDontunderstand
The Kth term of (a+b)^n is nC(k-1) A^(n-(k-1)) B^(k-1) ;where k is the term that you want

a=1, k=15, n=30, b=-t