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OpenStudy (anonymous):
What is the sum of the finite arithmetic series? (–5) + 0 + 5 + 10 + ... + 65 900 455 450 445
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OpenStudy (anonymous):
(–5) + 0 + 5 + 10 + ... + 65 5(-1 + 0 + 1 + 2 + ... + 13) 5(1 + 2 + 3 + ... + 13) - 5 \(\displaystyle\large \left(5\sum_{n=1}^{13}n\right) - 5\)
OpenStudy (anonymous):
\[5 \sum _{n=1}^{13} n-5=450 \]
OpenStudy (anonymous):
Is this clear, @vivianrush ?
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