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Given an arithmetic sequence whose first term is a, last term is l and common difference is d is:

The series of partial sums, Sn, is given by

Sn = 1/2*n*(a + l) = 1/2*n*[2a + (n-1)*d]



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9y ago
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9y ago

sum = ½ n (2a + (n - 1)d) = ½ n (first + last)

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Q: What is the general sum of an arithmetic sequence?
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