Ex 15.1

Chapter 15 Class 10 Probability
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Ex15.1, 10 A piggy bank contains hundred 50 p coins, fifty Rs 1 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 be a 50 p coin? Total number of coins in a piggy bank = 100 + 50 + 20 + 10 = 180 Number of 50 p coins = 100 Probability of getting a 50 p coin = ( 50 )/( ) = 100/180 = 5/9 Ex15.1, 10 A piggy bank contains hundred 50 p coins, fifty Rs 1 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 (ii) will not be a 5 coin? Total number of coins in a piggy bank = 180 Number of 5 coins = 10 P(not getting a 5 coin) = 1 P(getting a 5 coin) P(getting a 5 coin) = ( 5 )/( ) = 10/180 = 1/18 P(not getting a 5 coin) = 1 P(getting a 5 coin) = 1 1/18 = 17/18 