A ratio with denominator 0 is not defined.
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It is not defined.
Rational numbers
It is a rational fraction.
Not quite. A rational number is a ratio and each rational number is a ratio of specific pairs of integers - not ANY two integers. And, of course, 0 is not allowed on the denominator.
121 can be expressed as the ratio 121/1, where both numerator and denominator are integers, the denominator not being 0. That is the definition of a rational number.