Question: In a probability distribution table where the x can take on the values -1,0,1, 2 is the probability of the -1 value considered into the

In a probability distribution table where the x can take on the values -1,0,1, 2 is the probability of the -1 value considered into the total probability which is equal to 1? Or is it disregarded and only positive numbers for x are used.

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