Sequence Equations Flashcards
1
Q
Sn =
•a d n
A
n/2 [2a+(n-1)d]
2
Q
Sn =
•a l n
A
n/2 (a+l)
3
Q
Sn =
•a m r
A
a(r^m-1)
/
r-1
4
Q
Sn =
•a n r
A
a(r^n-1)
/
r-1
5
Q
Ratio?
A
2nd/1st
Or
3rd/2nd
6
Q
Tn =
•a n r
A
ar^n-1
7
Q
Tn =
•a d n
A
a+(n-1)d
8
Q
D
A
Common difference
9
Q
N
A
No. of terms
10
Q
L
A
Last term
11
Q
What’s an arithmetic series?
A
Same increment
1+3+5…
12
Q
What’s a geometric sequence?
A
Different increments
2+4+8…
13
Q
A =
A
First term
