Find the first four terms, in ascending powers of xxx, in the binomial expansion of (1+kx)6(1 + kx)^6(1+kx)6, where k k\,k is a non-zero constant.
Given that, in this expansion, the coefficients of x x\,x and x2 x^2\,x2 are equal, find the value of kkk.
Find the coefficient of x3x^3x3.
Practise Edexcel A Level Old Maths The Binomial Expansion with exam-style questions for A Level Old Maths. 10 questions, matched to the Edexcel A Level Old Maths (9371) specification and written in Unit exams C1, C2, C3 and C4 plus two applied units (e.g. S1 and M1) 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.