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

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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

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3
Q

What is the formula for the nth term in a GEOMETRIC sequence?

A

Un = ar^(n -1)

r = common ratio

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4
Q

What is the sum of the first n terms of a GEOMETRIC SERIES?

A

Sn = a(1 - r^n)/1 - r

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