Question

A piggy bank contains hundred 50 paise 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 : 

(i) Will be a 50 paise coin ? 

(ii) Will not be a Rs.5 coin ?

Answer 1

(i) Total number of coins = 100 + 50 + 20 + 10 = 180 

∴ Total number of possible outcomes of a coin will fall out = 180

Number of 50 p coins = 100 

∴ Number of favourable outcomes relating to fall out of a 50 p coin = 100 

Now, P(of getting a 50 p coin)