An arithmetic series is given by ∑r=418(5r+2)\sum_{r=4}^{18} (5r+2)∑r=418(5r+2).
(i) Write down the first term of the series. (ii) Write down the common difference. (iii) Find the number of terms in 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.