Q. 104.2( 206 Votes )

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?

Answer :

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 -


=

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