Conditional Probabilityhard
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A box contains red balls and blue balls. We draw balls one by one without replacement until a red ball is drawn. Given that the first red ball appears on the -th draw, what is the probability that the first ball drawn was blue?
A box contains red balls and blue balls. We draw balls one by one without replacement until a red ball is drawn. Given that the first red ball appears on the -th draw, what is the probability that the first ball drawn was blue?