A piggy bank contains hundred 50p coins, fifty Re 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
(i) Will be a 50 p coin?
(ii) Will not be a Rs 5 coin?
According to the question,
Total number of coins in a piggy bank = 100 + 50 + 20 + 10
= 180
(i) Number of 50 p coins = 100
Probability of a 50p coin = 
= 
= 
(ii) Number of Rs 5 coins = 10
Probability of a Rs 5 coin = 
= 
= 
Hence,
Probability of not getting a Rs 5 coin = 1 - 
= 
10