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)9 Give each coefficient as a simplified fraction or an integer where possible.
Practise Edexcel A Level Maths 4.2 Expanding (a + bx)^n with exam-style questions for A Level Maths. 99 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.