Series Flashcards
1
Q
Arithmetic series formula for Un?
A
Un = a + (n-1)d
2
Q
Arithmetic series sum of formulas?
A
Sn = n/2 (2a + (n-1)d)
Sn = n/2(a + L)
3
Q
Geometric formula for Un?
A
Un = ar^(n-1)
4
Q
Geometric series sums formulae?
A
Sn = [a (1-r^n)] / (1-r)
Sum to infinity = a/(1-r)
5
Q
What are properties of increasing, decreasing and periodic series?
A
Increasing: next term greater than prev.
Decreasing: next term less than prev.
Periodic: if Un+k = Un and its period/order is k
