The content of two urns is as given below: Urn (U1): x red balls and (y+1) black balls Urn (U2): (y+2) red and x black balls Experiment: We select one ball from the first urn (U1) and we put it in the second urn (U2), then we select a ball from urn (U2). Compute the probability of this event A: "the second ball drawn from urn U2 is red".

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