Coin can be tossed until a tail appears or until it has been tossed 3 times. given that tail does not occur on the first toss, whats probability that the coin is tossed 3 times?

For the coin to be tossed three times given the first toss is not a tail, the second toss must not be a tail. Since the probability of not getting a tail is 1/2. Therefore, the probability that the coin is tossed three times is 1/2.

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The method to find the female dormitory is 2-d=800