Question: In each case, determine whether the given function is a probability distribution. a. P(x) = 1/2x where x = 1, 2, 3,... b. P(x) =

In each case, determine whether the given function is a probability distribution.
a. P(x) = 1/2x where x = 1, 2, 3,...
b. P(x) = 1/2x where x = 1, 2, 3,...
c. P(x) = 3/ [4(3 - x)!x!] where x = 0,1,2, 3
d. P(x) = 0.4(0.6)x-1 where x = 1, 2, 3,...

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