Series and sequences equations
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4 Terms
1
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arithmetic sequence:
Un = a + (n-1)d
a = first term
d = common difference
2
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geometric sequence:
Un = arn-1
a = first term
r = common ratio
3
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arithmetic series:
Sn = ½ n(a+l) = ½ n [2a + (n-1) d]
4
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geometric series:
Sn = a(1-rn) / 1-r
Note 
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