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Answer : 2 2/3 Explanation : Answer: B) 2/3 Explanation: Total coins 30In that,1 rupee coins 2050 paise coins 10Probability of total 1 rupee coins =  20C11Probability that 11 coins are picked = 30C11Required probability of a coin now picked from the box is 1 rupee = 20C11/30C11 = 2/3.

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