Find the first four terms, in ascending powers of xxx, in the binomial expansion of 1(1−x)2\displaystyle \frac{1}{(1-x)^2}(1−x)21
43 exam-style questions on WJEC A Level Maths 3.4.1 Sequences and Series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.