The first term of a geometric series is 5 and the common ratio is 0.75.
Find the second term and the sum to infinity.
Find the smallest value of n n\,n for which Sn>19S_n > 19Sn>19.
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.