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OpenStudy (anonymous):
Determine the sum for the arithmetic series: (Problem Attached)
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OpenStudy (anonymous):
OpenStudy (anonymous):
Answer Choices: A. 100 B. 165 C. 200 D. 350
OpenStudy (anonymous):
sorry but thats a hard one ={
OpenStudy (anonymous):
Aww :( Okay
OpenStudy (anonymous):
i am not good with sigmas
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OpenStudy (anonymous):
Oh okay
OpenStudy (anonymous):
its like (30-10)+(30-11)+(30-12)+(30-13)+........(30-19)+(30-20) its like adding from 20 to 10 all numbers
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