Find the first four terms, in ascending powers of xxx, of the binomial expansion of
(3+16x)9\left(3 + \frac{1}{6}x\right)^9(3+61x)9Give each coefficient as a simplified fraction or an integer where possible.
408 exam-style questions on Edexcel A Level Maths Binomial Expansion, covering 4.1 Expanding (1 + x)^n, 4.2 Expanding (a + bx)^n, and 4.3 Using Partial Fractions. Each one has a worked solution and a mark scheme showing where the marks go.