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For what values of k: F(x) = (1k)k x , can serve as the values of the probability distribution of a random variable with numerable

For what values of $k :$ $F (x) = (1 - k) k^{x}$ , can serve as the values of the probability distribution of a random variable with numerable infinite interval $x = 0, 1, 2, . . .$ ?

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