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OpenStudy (anonymous):
The sequence –5, 0, 5, 10,..., 65 has 15 terms. Evaluate the related series. Is it 450?
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Parth (parthkohli):
Series is the sum of all the terms.
OpenStudy (anonymous):
I got 450 as my answer, i that correct?
Parth (parthkohli):
10 + 15 + 20 + 25 + 30 + 35 + 40 + 45 + 50 + 55 + 60 + 65
Parth (parthkohli):
Yes. it is 450
Parth (parthkohli):
You can also use sigma notation to solve.
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OpenStudy (anonymous):
Sn = (a1+an)*n/2 Sn = (-5 + 65) *15 / 2 = 450
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