What is the harmonic mean of the set of numbers {4,6,12}\{4, 6, 12\}{4,6,12}?
666
7.337.337.33
(14+16+1123)−1\left(\frac{\frac{1}{4} + \frac{1}{6} + \frac{1}{12}}{3}\right)^{-1}(341+61+121)−1
6.606.606.60