The function f is defined by f(x) = ~$-\frac{1}{x}$~ for all nonzero numbers x. If f(a) = ~$-\frac{1}{2}$~ and f(ab) = ~$\frac{1}{6}$~ , then b =
3
~$\frac{1}{3}$~
~$-\frac{1}{3}$~
-3
-12
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