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An experiment consists of tossing 7 fair (not weighted) coins, except one of the 7 coins has a head on both sides. Compute the probability

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An experiment consists of tossing 7 fair (not weighted) coins, except one of the 7 coins has a head on both sides. Compute the probability of obtaining exactly 2 heads. The probability of obtaining exactly 2 heads is El. (Type an integer or a fraction.)

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