SOLUTION: Find S17 for the series 8 - 4 + 2

SOLUTION: Find S17 for the series 8 - 4 + 2 - 1+ ...

Question 1202470: Find S17 for the series 8 - 4 + 2 - 1+ ...
Found 2 solutions by mananth, ikleyn:
Answer by mananth(16946)   (Show Source): You can put this solution on YOUR website!
Sn=(a1*(1−r^n))/(1−r)

a1=8
r=-1/2
S17 = ?

S17 =5.3333
Answer by ikleyn(52788)   (Show Source): You can put this solution on YOUR website!
.

        The formula and the final answer/value in the post by @mananth are incorrect.
        I came to bring a correct solution/answer.

= a = 8 r = -1/2 = S17 = 5.3333740234375 (exact value).

Solved (correctly).

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