3. A Kiddy bank contains hundred 50p coins, fifty 1 coins, twenty 2 coins and ten 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 (1) will be a 50 p coin? (ii) will not be a 5 coin?
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Answer:
We know that,
Probability = Number of possible outcomes/Total number of favorable outcomes.
Total number of coins = 100 + 50 + 20 + 10 = 180
Number of 50 p coins = 100
Number of Re 1 coins = 50
Number of Rs 2 coins = 20
Number of Rs 5 coins = 10
(i) Probability of drawing 50 p coin = 100/180
(ii) Probability of getting a Rs 5 coin = 10/180 = 1/18
Probability of not getting a 5 rupee coin is 1 - 1/18 = 17/18 [Since, P(E) + P(not E) = 1]
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