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If $\log_{a} 30 = A, \log_{a} (5/3) = – B$ and $\log_{2} a = 1/3,$ then $\log_{3}a$ equals

1. $\frac{2}{A + B} – 3$
2. $\frac{A + B - 3}{2}$
3. $\frac{2}{A + B – 3}$
4. $\frac{A + B}{2} – 3$