Sequence Formulas Flashcards
1
Q
a1
A
First term
2
Q
an
A
nth term
3
Q
a n-1
A
previous term
4
Q
a n+1
A
next term
5
Q
d
A
common difference
6
Q
r
A
common ratio
7
Q
Geometric Series Formula
A
Sn = (a1 (1 - r^2)) / 1 - r
8
Q
Infinite Geometric Series
A
Sā = a1 / 1 - r
9
Q
Arithmetic Sequence Sum Formula
A
Sn = n/2 ( a1 + an )
Sn = n/2 ( 2a1 + (n - 1)d )
10
Q
Amount Borrowed Formula
A
Price - Down Payment
