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It is an impossible event - which has probability zero.
If in your data Zero is used then yes.
No ,zero is not positive or negative so the outcome is the same as it was to begin with. In other words, you broke even.
A probability of one means that the outcome will definitely occur.Not asked, but answered for completeness sake - a probability of zero means that the outcome will definitely not occur. Probability always lies between zero and one, inclusive.
Zero percent. Luck is what we call a set of circumstances that have a favorable outcome.