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OpenStudy (anonymous):
What is the sum of the arithmetic series below?
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OpenStudy (anonymous):
OpenStudy (anonymous):
is it 330
OpenStudy (anonymous):
is it?
OpenStudy (anonymous):
Distribute the summation, then you can get 3 * 16(17)/2 - 2*16 = 376
OpenStudy (anonymous):
Oh I think I read that wrong. Thought it was a 16 instead of 15. Change it to: 3 * 15(16)/2 - 2*15 = 330 or what @matricked said :)
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