An ordered list of terms is a [ ]; adding its terms produces a series.
d=−4d=-4d=−4
For first term aaa and common difference ddd, un=a+(n−1)du_n=a+(n-1)dun=a+(n−1)d. The last included term is l=a+(n−1)d\boxed{l=a+(n-1)d}l=a+(n−1)d.
An ordered list of terms is a sequence; adding its terms produces a series.
Term nnn is reached after n−1n-1n−1 jumps.
Flashcards for OCR A Level Maths 1.4.8 Arithmetic sequences and series (A-level only), covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 22 cards, matched to the OCR A Level Maths (H240) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.