Because the probability of an impossible event is 0 and probability lies within the area of {0-1} meaning 0 is impossible and 1 is definite. If you took an improper fraction such as 5/4 and made it a proper faction, it would be 1 1/4 making it more than 1 or (100%) and that wouldn't make any sense because 4/4 (1) is definite, anything more isn't a probability.
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fraction or possible
The probability of an impossible event is 0.The probability of an impossible event is 0.The probability of an impossible event is 0.The probability of an impossible event is 0.
A probability event that is impossible is one that will not happen, i.e. its probability is zero.
Usually, a fraction is already a probability. Like if you roll a die, the probability that you will get a 1 is 1/6. So your probability would be your fraction.
An impossible event has a probability of 0 (or 0%).