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Let X be a number chosen at random from the set {1, 2, ... ,20} and...

Let X be a number chosen at random from the set {1, 2, ... ,20} and let Y  be a number chosen at random from the set {1, 2, ... , X }. Let pX |Y (x|y) denote the condition distribution of X, given that Y  =  y. Find pX |Y (19|18)
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