To evaluate the expression given (1 divided by 3 divided by 0), we need to clarify it. The way it's presented suggests we might be looking at a division operation:
\[ \frac{1}{3 \cdot 0} \]
However, this involves division by zero, which is undefined in mathematics.
If the expression meant to represent something different, such as:
\[ \frac{1}{3} \div 0 \]
this is also undefined because division by zero is not possible.
Thus, regardless of how we interpret the expression, the result is:
Undefined.
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