Question
A box contains four Rs. 2 coins, eight Rs. 1 coins, and
sixteen Rs. 5 coins. One coin is lost. Find the probability that the lost coin is not a Rs. 2 coin.Solution
Number of Rs. 2 coins = 4
Total number of coins = 4 + 8 + 16 = 28
So, the required probability = 1 - 4/28 = 24/28 = 6/7
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