1.

A biased coin (with probability of obtaining a head equal to p>0) is tossed repeatedly and independently until the first head is observed. The probability that the first head appears at an even numbered toss, is

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A biased coin (with probability of obtaining a head equal to p>0) is tossed repeatedly and independently until the first head is observed. The probability that the first head appears at an even numbered toss, is



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