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Question2. An urn initially contains r red balls and b blue balls. In each step, a...

Question2.
An urn initially contains r red balls and b blue balls. In each step, a ball is chosen uniformly at random, and then put back into the urn together with a new ball of the same color. Let Ri be the event that in step i a red ball is chosen from the urn. Show that P(R1 ∩ R2) = P(R2 ∩ R3).

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