The first n n\,n terms of an arithmetic series are 21+34+47+60+⋯+177+19021 + 34 + 47 + 60 + \dots + 177 + 19021+34+47+60+⋯+177+190.
Find the value of n n\,n and the sum of these n n\,n terms.
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.