Chapter 8 Flashcards
1
Q
0!
A
1
2
Q
∑i
A
N(N + 1) / 2
3
Q
∑i2
A
N(N + 1)(2N + 1) / 6
4
Q
∑i3
A
N2(N + 1)2 / 4
5
Q
Arithmetic: aN
A
a1 + d(N - 1)
6
Q
Arithmetic: sN
A
N/2 (a1 + aN)
or
N/2 (2a1 + d(N - 1))
7
Q
Geometric: aN
A
a1rN - 1
8
Q
Geometric: sN
A
a1(1 - rN / 1- r)
9
Q
Infinite: s∞
A
a1 / 1 - r
10
Q
5!
A
5 ⋅ 4 ⋅ 3 ⋅ 2 ⋅ 1
11
Q
Alternating starting +
A
(-1)N + 1
12
Q
Alternating starting -
A
(-1)N
13
Q
When is a geometric sum infinite?
A
When r is greater than 0 and less than 1
14
Q
If in between a sequence: first count is the same
A
Arithmetic
15
Q
If in between a sequence: second+ count is the same
A
Squared, cubed, ect.