The first three terms of an arithmetic series are (2x−3)(2x-3)(2x−3), (5x−2)(5x-2)(5x−2) and (10x−7)(10x-7)(10x−7) respectively.
Find the value of the constant xxx.
Find the sum of the first 25 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.