Q3 of 54 Page 320

A kiddy bank contains hundred 50p coins. Fifty DI coins, twenty D2 coins and ten D5 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 50p coin?

There are hundred 50p coins, 50 DI coins, 20 D2 coins and 10 D5 coins.

⇒ Total number of coins in kiddy bank = 100 + 50 + 20 + 10


⇒ Total number of coins in kiddy bank = 180


⇒ Probability that the coin will be 50p coins –


⇒ P(coin will be 50p coin) =


⇒ P(coin will be 50p coin) =


⇒ P(coin will be 50p coin) =


∴ Probability that the coin will be 50p coin is


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