Sequences and series

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7 Terms

1
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Arithmetic series Un

A + (n-1)d

2
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Sum of arithmetic series both equations

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

N/2 (A+L)

3
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Geometric series nth term

Ar^n-1

4
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Sum of geometric series

A ( r^n -1 )/r-1

5
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Sum to infinity

A/1-r

6
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What is convergent | r | <1

7
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