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Question
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 not be a Rs. 5 coin?
Sum
Solution
Total number of coins in a piggy bank = 100 + 50 + 20 + 10 = 180
∴ Total possible outcome = 180
Number of Rs 5 coins = 10
Number of not ₹ 5 coin = 180 − 10 = 170
Favourable outcomes = 170
= `"Favourable outcomes"/"Total possible outcome"`
= `170/180`
= `17/18`
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