SOLUTION: the sum of a geometric series of 6 terms with ratio 2 is negative 189. what is the first term?
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Question 550239: the sum of a geometric series of 6 terms with ratio 2 is negative 189. what is the first term?
Answer by TutorDelphia(193) (Show Source): You can put this solution on YOUR website!
First we need to know the formula of a geometric series:
Its
Where s=sum, a=the first term r is the ratio and n is the number of terms
We know most of the info already
-189=a(1-64)/-1
a=-3
You won't have to do this step, but to get a feel for the series, here's our terms -3,-6,-12,-24,-48,-96 and they do equal -189
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