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Do the symbols 3,7,11,15,…3, 7, 11, 15,\ldots3,7,11,15,… represent a sequence or a series?
A
The standard finite sum ∑r=1nr\displaystyle\sum_{r=1}^{n}rr=1∑nr equals n(n+1)2\boxed{\displaystyle\frac{n(n+1)}{2}}2n(n+1).
B
A sequence, because the terms are separated by commas.
C
The upper limit is the final index, and 3r+1=313r+1=313r+1=31 gives r=10r=10r=10.
D
Add the specified terms.
Card 1 of 24
3.3.3 Sequences and series (A-level only) Flashcards
24 flashcards on CCEA A Level Maths 3.3.3 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.