Work out the first three terms in the binomial expansion of (1+3x)12\displaystyle (1 + 3x)^{\frac{1}{2}}(1+3x)21.
[3]
b.
Write down the range of values of x x\,x for which the expansion is valid.
[1]
Markscheme
3.3.7 Sequences and series (A-level only) Questions
36 exam-style questions on CCEA A Level Maths 3.3.7 Sequences and series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.