Sequence Formulas Flashcards by Deon .

Q

a1

A

First term

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Q

an

A

nth term

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Q

a n-1

A

previous term

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Q

a n+1

A

next term

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Q

d

A

common difference

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Q

r

A

common ratio

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Q

Geometric Series Formula

A

Sn = (a1 (1 - r^2)) / 1 - r

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Q

Infinite Geometric Series

A

S∞ = a1 / 1 - r

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Q

Arithmetic Sequence Sum Formula

A

Sn = n/2 ( a1 + an )
Sn = n/2 ( 2a1 + (n - 1)d )

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Q

Amount Borrowed Formula

A

Price - Down Payment

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