題組內容
3. (10%) Let X have the probability mass function $$f_X(x) = P[X = x] = \frac{3}{2} \left(\frac{1}{2}\right)^{2|x|}, x = \pm 1, \pm 2, \dots$$
(a) \( (5\%) \) Find \( P[X = 1,2,3,\dots ] \)
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3. (10%) Let X have the probability mass function $$f_X(x) = P[X = x] = \frac{3}{2} \left(\frac{1}{2}\right)^{2|x|}, x = \pm 1, \pm 2, \dots$$
(a) \( (5\%) \) Find \( P[X = 1,2,3,\dots ] \)