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Last updated 2:24 AM on 10/21/22
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7 Terms
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1
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Arithmetic find An
An= A1+ (n-1)d
2
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Arithmetic find sum
An= n/2(A1+An)
3
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Geometric find An
An = A1 (r^n-1)
4
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Geometric find sum
Sn= A1 (1-r^n/1-r)
5
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Infinite sum (only if |r| <1)
A1/r-1
6
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Sum if k^2
n(n+1)(2n+1)/6
7
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Sum if k^3
[n(n+1)/2]^2