Let Yk denote the number of failures between successes k - 1 and k of a Bernoulli

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Let Yk denote the number of failures between successes k - 1 and k of a Bernoulli (p) random process. Also, let Yi denote the number of failures before the first success. What is the PMF PYk(y)? Is Yk an iid random sequence?
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