Arithmetic and Geometric Sequence

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6 Terms

1
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d =

an+1 - an

2
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an= (arethmitic)

a1+r(n-1)

3
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Sn=

n/2(a1 + an)

4
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r =

(an+1) / (an)

5
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an = (geometric)

a1 rn-1

6
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Sinfinity =

(a1) / (1 - r)