Expand (1+3x)4(1 + 3x)^4(1+3x)4, simplifying each term.
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Markscheme
1.4.1 Binomial expansion for positive integer n Questions
108 exam-style questions on OCR A Level Maths 1.4.1 Binomial expansion for positive integer n. Each one has a worked solution and a mark scheme showing where the marks go.