No.
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If the denominator is 0.
If the denominator is 0.
A ratio with denominator 0 is not defined.
0 cannot be the denominator, but all numbers can be in the denominator.If the whole denominator equals 0 (so things like 3+0 or y+0 wouldn't count) then the fraction's value is undefined since no number can be divided by 0 and give one answer. But if the question is exactly as it is phrased, there is no number that can never be in the denominator.
It is not possible to have nothing. If you don't have anything in numerator, it will be 0 (zero) by default. And when there is 0 in numerator, it doesn't matters what number is in denominator because the answer will be 0 only. So if there is nothing in the numerator but something is in the denominator, the answer will be 0.