sequences Flashcards
1
Q
Arithmetic sequence formula for calculating a term
A
Un= a + (n-1)d
a = first term
d= difference
2
Q
geometric sequence formula for calculating a term
A
Un= ar^n-1
3
Q
How to prove a sequence is increasing
A
U(n+1) - Un > 0
Or Un+1 >Un
4
Q
S∞ is known as the sum to infinity
If |r| ≥ 1 the geometric series is ……… and the sum to infinity does not exist
A
divergent
5
Q
A sequence is periodic if the terms ……. in a cycle
The ……. (or period) of a periodic sequence is the number of terms in each repeating cycle
A
repeat
order
