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Which sequence model suits a quantity changing by the same amount each period?
A
£6,020
B
Pn=800(1.15)nP_n=800(1.15)^nPn=800(1.15)n
C
The arithmetic series sum is Sn=n2(2a+(n−1)d)S_n=\frac{n}{2}\left(2a+(n-1)d\right)Sn=2n(2a+(n−1)d). For r≠1r\neq1r=1, the geometric series sum is Sn=a(1−rn)1−r\boxed{S_n=\frac{a(1-r^n)}{1-r}}Sn=1−ra(1−rn).
D
An arithmetic sequence.
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3.3.8 Sequences and series (A-level only) Flashcards
25 flashcards on CCEA A Level Maths 3.3.8 Sequences and series (A-level only): the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.