Piggy Bank~!!!
A piggy bank contains hundred 50 Paise coins, fifty Re1 coins, twenty Rs.2 coins and ten Rs.5 coins. if it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin will not be a Rs.5 coin?
The answer is 0.94.
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1 solution
There are 180 coins in total; add 100,50,20 and 10. While there are only 10 Rs. 5 coins. Probability of "not" getting Rs. 5 can be calculated simply by taking 10 away from 180 and then dividing by the total number of coins (ie 180). Leaving us with 17/18 or 0.94 (to 2dp)