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A piggy bank contains hundred 50p coins, fifty Re. 1 coins, twenty Rs. 2 coins and ten Rs. 5 coins.

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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 ? Select the correct answer from above options

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Number of 50 ps coins = 100 Number of Re. 1 coins = 50 Number of Rs. 2 coins = 20 Number of Rs. 5 coins = 10 ∴ Total number of coins, n(S) = 180 (i) Possibility of one 50 ps coin : n(A) = 100 (ii) Possibility of one Rs. 5 coin: n(B) = 180 – 10 = 170 (∵ 10 coins are Rs. 5)

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