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OpenStudy (anonymous):
Write the series in summation notation: 100 + 95 + 90 + 85 + 80
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OpenStudy (anonymous):
Let \[S=100+95+90+85+80=5(20+19+18+17+16)\] \[\therefore S=5(16+17+18+19+20)\] The sum of the terms in the bracket can be written using a summation \[S=5\sum_{i=16}^{20}i\]
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