Edexcel Mathematics Specimen paper · Paper 2 · Question 11 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

Specimen paper · Paper 2 · Question 11 · 5 marks

11. The second, third and fourth terms of an arithmetic sequence are 2k, 5k –10 and 7k –14 respectively, where k is a constant. Show that the sum of the first n terms of the sequence is a square number.

Lesson: Binomial Expansion for Positive Integer n