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 not be a D5 coin?

Probability the coin will be a D5 coin –

⇒ P(Coin will be a D5 coin) =


⇒ P(Coin will be a D5 coin) =


⇒ P(Coin will be a D5 coin) =


∴ P(coin will not be a D5 coin) = 1 – P(coin will be a D5 coin)


⇒ P(coin will not be a D5 coin) =


⇒ P(Coin will not be a D5 coin) =


⇒ P(Coin will not be a D5 coin) =


∴ Probability that the coin will not be D5 coin is .


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