Using the Product Rule of Exponents, when you multiply two expressions with the same base, you add their exponents.
In your case, you have:
\[ (1/3)^6 \cdot (1/3)^3 \]
According to the Product Rule:
\[ (1/3)^6 \cdot (1/3)^3 = (1/3)^{6+3} = (1/3)^9 \]
So the equivalent form is:
\[ (1/3)^9 \]
The correct response is:
(1/3)^9