Card 1 of 20
What does the index rrr do in ∑r=1n\sum_{r=1}^{n}∑r=1n?
A
n(n+1)(2n+3)2\displaystyle \mathbf{\frac{n(n+1)(2n+3)}{2}}2n(n+1)(2n+3)
B
An overestimate.
C
It takes the integer values 111 to nnn.
D
Dividing [a,b][a,b][a,b] into nnn equal strips gives width Δx=b−an\boxed{\displaystyle \Delta x=\frac{b-a}{n}}Δx=nb−a.
Card 1 of 20
1.11.4 Integration as the limit of a sum (A-level only) Flashcards
20 flashcards on AQA A Level Maths 1.11.4 Integration as the limit of a sum (A-level only): the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.