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What formula represents the partial sum of the first n terms of the series 5 10 15 20 25?
Wiki User
∙ 6y ago
The series given is an arithmetic progression consisting of 5 terms with a common difference of 5 and first term 5
→ sum{n} = (n/2)(2×5 + (n - 1)×5) = n(5n + 5)/2 = 5n(n + 1)/2
As no terms have been given beyond the 5th term, and the series is not stated to be an arithmetic progression, the above formula only holds for n = 1, 2, ..., 5.
Wiki User
∙ 6y ago
Wiki User
∙ 10y agoThe numbers 5 10 15 are not consistent with 4n - 1 (or anything like it).
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