• The Printed Answer Booklet consists of 20 pages. The Question Paper consists of 12 pages. © OCR 2018 H640/01 Turn over 603/1002/9 B10025/5.0 2 Formulae A Level Mathematics B (MEI) (H640) Arithmetic series S 1 n(a l) 1 n{2a (n 1)d} n 2 2 ...