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two counterfeit coins of equal weight are mixed with identical genuine coins. the weight of each of the counterfeit coins is different from the weight of each of the genuine coins. a pair of coins is selected at random without replacement from the coins. a second pair is selected at random without replacement from the remaining coins. the combined weight of the first pair is equal to the combined weight of the second pair. what is the probability that all selected coins are genuine?
Sagot :
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