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The sum of the infinite GP $1 + 1/3 + 1/9 + 1/27 + \cdots$ is:
A$3/2$, since $S_\infty = a/(1 - r) = 1/(1 - 1/3) = 3/2$
B$2/3$, the inverse ratio computed wrong on the chart
C$3$, the first plus the second term simply summed
D$1$, equal to the first term of the infinite series
Answer & Solution
Correct answer: A. $3/2$, since $S_\infty = a/(1 - r) = 1/(1 - 1/3) = 3/2$
$S_\infty = 1/(1 - 1/3) = 3/2$.
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