Sequences And Series Flashcards
1
Q
The formula for the nth term of an ARITHMETIC sequence is?
A
Un = a + (n-1)d
a = first value
d = common difference
2
Q
What are the 2 formulas for finding the sum (Sn) of the first n terms of an ARITHMETIC SERIES?
A
Sn = 0.5n(2a + (n - 1)d)
Sn = 0.5n(a + L)
L = Last term
3
Q
What is the formula for the nth term in a GEOMETRIC sequence?
A
Un = ar^(n -1)
r = common ratio
4
Q
What is the sum of the first n terms of a GEOMETRIC SERIES?
A
Sn = a(1 - r^n)/1 - r
