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A bag contains 10 rupee - coins, 7 fifty...

A bag contains 10 rupee - coins, 7 fifty-paise coins and 4 twenty finve-paise coins. Fine the probability of drawing (i) a rupee-coin (ii) three rupee-coins and (iii) three coins, one of each type, in the random drawing of three coins from the bag.

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The correct Answer is:
(ii) `(12)/(133)` (iii) `(4)/(19)`
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