The first three terms of an arithmetic series are (k+3)(k + 3)(k+3), (2k+4)(2k + 4)(2k+4) and (4k−2)(4k - 2)(4k−2) respectively.
Given that the value of the constant k k\,k is 7, find the first three terms of the series.
Find the sum of the first 20 terms of the series.
326 exam-style questions on Edexcel A Level Maths Sequences and Series, covering 3.1 Arithmetic Sequences, 3.2 Arithmetic Series, 3.3 Geometric Sequences, 3.4 Geometric Series, 3.5 Sum to Infinity, 3.6 Sigma Notation, 3.7 Recurrence Relations, and 3.8 Modelling with Series. Each one has a worked solution and a mark scheme showing where the marks go.