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Let's think about it you can have a probabilities you can have:
You can have a probability of a hundred percent, right? Like you could have an event that had a hundred percent probability of it happening, correct?
So 1 -> 100% it totally possible.
1/3 is less than one so that works.
3/5 is less than one so that works.
5/3 however is giving you not only a hundred percent probability of something occurring, it's giving you MORE THAN a 100% chance of an event happening.
Does that make sense? You cannot have more of a 100% chance.
Therefore, 5/3 cannot be the probability of an event. I can give you actual examples if you need some more help understanding.