AMC 10 2008b Problem 17

A poll shows that $70\%$ of all voters approve of the mayor's work. On three separate occasions a pollster selects a voter at random. What is the probability that on exactly one of these three occasions the voter approves of the mayor's work? $\mathrm{(A)}\ {{{0.063}}} \mathrm{(B)}\ {{{0.189}}} \mathrm{(C)}\ {{{0.233}}} \mathrm{(D)}\ {{{0.333}}} \mathrm{(E)}\ {{{0.441}}}$