Question
A box contains eight Rs. 1 coins, ten Rs. 2 coins, and two
Rs. 5 coins. One coin falls out and gets lost. What is the probability that the lost coin is not a Rs. 5 coin?Solution
Number of Rs. 5 coins = 2
Total number of coins = 8 + 10 + 2 = 20
So, the required probability = 1 - 2/20 = 18/20 = 9/10
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