Which statement is true: $\frac{0}{0}$ equals 0, 1, or infinity?

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Which of the following statements is true?

\frac{0}{0} = 0 \; \; \text{or} \; \; \frac{0}{0} = 1 \; \; \text{or} \; \; \frac{0}{0} = \infty
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Assuming we're talking about real numbers, none of them.
 
what is the \sqrt{mouse} ?

or how about:
\int{+d-} ?
 

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