Find the sum of the series \(1 + 1/3 + 1/9 + 1/27 + ...\) to infinity.
Answer: B
This is an infinite G.P. with first term \(a=1\) and common ratio \(r = (1/3)/1 = 1/3\). The sum is \(S_\infty = \frac{a}{1-r} = \frac{1}{1-1/3} = \frac{1}{2/3} = 3/2\).