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OpenStudy (anonymous):
Evaluate the indicated sum of each of the arithmetic series given below. t1=11, t20=101, find S20
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OpenStudy (nenadmatematika):
Sn=n(n+1)/2 so your sum is 20(20+1)/2=420/2=210
OpenStudy (nenadmatematika):
omg I'm wrong sorry here is the solution :D
OpenStudy (nenadmatematika):
Sn=(11+101)*(20/2)=112*10=1120
OpenStudy (nenadmatematika):
this is the formula for the sum of any arithmetic sequence: |dw:1329522284728:dw|
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