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Is the following function a probability mass function for some random variable? p(x) = 0.6 if x = 1 0.2 if x = 0 0.2

Is the following function a probability mass function for some random variable?

p(x) =

0.6 if x = 1

0.2 if x = 0

0.2 if x = -1

0 otherwise

Yes or No? Explain.

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