This is an example of Further Maths Paper 4 (2020 Syllabus) 9231/4 Probability Generating Functions (pgf) using OCR 4735/01 June 2015 exam question 4.

PART 1:

Part 2:

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CAIE Further Probability & Statistics 9231 (Paper 4) Specimen Paper 2020 Q6

Solutions [PDF]