What is the coefficient of x^13 in the expansion of (3x)(2x+5)^20?
Added by Kaitlyn H.
Step 1
The general term of this expansion is given by: (20 choose k) * (2x)^(20-k) * (5^k) where (20 choose k) is the binomial coefficient, which represents the number of ways to choose k items out of a set of 20. We can simplify this expression by using the formula Show more…
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