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If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 1 over 20 , what are the odds against an earthquake?

Would the answer be 19:1?

yes

why not just write 1/20?

Thanks.

Forgive my grammar.

Yes, the odds against an event can be expressed as a ratio. In this case, if the probability of an earthquake occurring is 1/20, the odds against an earthquake occurring would be 19:1. This means that for every 19 days without an earthquake, there is 1 day with an earthquake.