19) $2 \div \frac{1}{3}$

Step 1 ：The question is asking for the result of dividing 2 by 1/3. In mathematics, dividing by a fraction is the same as multiplying by its reciprocal. The reciprocal of 1/3 is 3/1, or simply 3. So, we need to multiply 2 by 3.

Step 2 ：\(2 \times 3 = 6\)

Step 3 ：Final Answer: \(\boxed{6}\)