Arithmetic + Geometric Sequence Formulae

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Arithmetic Sequence

Finding the 'n'th term with a common difference.

n = a + (n-1)d

a = first term

n = what term

d = difference

Finding terms with a sum

n/2 (2a +(n-1)d)

1 of 2

Geometric Sequence

Finding Terms

n = ar^n-1

a = first term

r = common ratio

n = what term

Log rule to solve geometric problems when you do not have a power

Logn(x)

n = base/common ratio

x = other number

2 of 2

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