SOLUTION: S8= 2250, r= 2, A3= ?

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Question 1041517: S8= 2250, r= 2, A3= ?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
S8= 2250, r= 2, A3= ?
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Assuming your S(8) is the sum of the 1st 8 elements of the series,
S(8) = a[(1-2^8)/(1-2)] = 2250
a[(-255/-1)] = 2250
a = 2250/255 = 8.82
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a(3) = a*r^2 = 8.82*4 = 35.29
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Cheers,
Stan H.
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