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OpenStudy (anonymous):
Use the formula for the sum of the first n terms of a geometric sequence to solve. Find the sum of the first four terms of the geometric sequence: 2, 10, 50, . . . okay so my problem with this is it is in word problem form
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OpenStudy (anonymous):
so n= 4 and r= 5
OpenStudy (anonymous):
and a1 = 2 right
OpenStudy (klimenkov):
Yes. Continue.
OpenStudy (anonymous):
so then when I plug those in I get 312
OpenStudy (klimenkov):
Do you know the formula that you need?
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OpenStudy (anonymous):
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