Ononot — Let X be discrete with P(X=k) = p(1-p)^{k-1} for k = 1, 2, 3

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Let $X$ be discrete with $P(X=k) = p(1-p)^{k-1}$ for $k = 1, 2, 3, \ldots$ and $p = 0.25$ . What is $P(X \text{ is odd})$ ?