Sequences and Series - 4 Flashcards
1
Q
How do you find the nth term for an arithmetic series
A
Un = a + (n-1)d
2
Q
how do you find the sum of an arithmetic series
A
Sn = n/2 (2a+(n-1)d)
3
Q
how do you find the nth term of a geometric sequence?
A
Un = ar^n-1
4
Q
how do you find the sum of a geometric sequence?
A
Sn = a(r^n -1) /r-1
5
Q
how do you find the sum to infinity?
A
S infinity = a/1-r
6
Q
how do you calculate r
A
2nd term / 1st term
7
Q
what is n
A
term number
8
Q
what is d
A
the difference
