Series Flashcards
1
Q
Arithmetic nth term
A
un = a + (n-1)d
2
Q
Arithmetic Sums
A
n/2 (2a+(n-1)d)
n/2 (a+l)
3
Q
Geometric nth term
A
ar^(n-1)
4
Q
Geometric sum
A
a(1-r^n) / (1-r)
5
Q
Geometric sum to infinity
A
a / (1-r)
6
Q
Increasing sequence if
A
u(n+1) > u(n) for all n
7
Q
Decreasing sequence if
A
u(n+1) < u(n) for all n
