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Balls are drawn from an urn containing 2 white and 5 black balls until a white ball appears. Let X be the rv that denotes
Balls are drawn from an urn containing 2 white and 5 black balls until a white ball appears.
Let X be the rv that denotes the number of black balls drawn before a white ball appears.
What is the domain and range of X? Give a table of the probability mass function of X.
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