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# Binomial question watch

1. The first part was find the binomial expansion of (1-x)^-1 and (1-2x)^-1, find the expansion of each in ascending powers of x up to the term x^3. The next part is multiply out the expansions up to the term x^3. Which is what i did, the next part is determine the coeffient of x^n in the series expansion. I dont get it? I did the first bits easily but this bit i dont get.
2. (Original post by SunDun111)
The first part was find the binomial expansion of (1-x)^-1 and (1-2x)^-1, find the expansion of each in ascending powers of x up to the term x^3. The next part is multiply out the expansions up to the term x^3. Which is what i did, the next part is determine the coeffient of x^n in the series expansion. I dont get it? I did the first bits easily but this bit i dont get.

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3. (Original post by physicsmaths)

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I figured it out! yeah ill make the question clearer next time

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Updated: June 2, 2016
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