Question 1 - A-Level Maths

Exam Board	AQA
Module	Further Paper 1 (Further Paper 1)
Year	2021
Session	June
Topic	Arithmetic Sequences and Series

1 Find $$\sum _ { r = 1 } ^ { 20 } \left( r ^ { 2 } - 2 r \right)$$ Circle your answer. 24502660532043680