series/ sequences Flashcards
1
Q
nth term arithmetic?
A
a+(n-1)d
2
Q
sum term arithmetic? - FB
A
n/2(2a+(n-1)d)
3
Q
nth term geometric?
A
ar^n-1
4
Q
sum term geometric?
A
a(1-r^n)/1-r
5
Q
when is geometric series convergent?
A
|r|<1
6
Q
what is the sum to infinity for a geo convergent series?
A
a/1-r
