Arithmetic/geometric formulas

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6 Terms

1
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Arithmetic explicit

an = d(n-1) + a1

2
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Geometric recursive

a1= ; (an-1)r

3
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Geometric explicit

an = (a1)r^n-1

4
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Arithmetic recursive

a1= ; an = an-1 + d

5
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Geometric series

Sn = a1-r(an) / 1-r

6
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Arithmetic series

Sn = n(a1+an) / 2