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An urn contains 9 red, 7 white and 4 black balls. If two balls are drawn at random, find the probability that: (i) both the balls are red,(ii) one bal

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An urn contains 9 red, 7 white and 4 black balls. If two balls are drawn at random, find the probability that: (i) both the balls are red,(ii) one ball is white (iii) the balls are of the same colour (iv) one is white and other red. Select the correct answer from above options

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n ( S ) = . 20 C 2 n P 1 = . 9 C 2 . 20 C 2 P P 2 = . 7 C 1 ⋅ . 13 C 1 . 20 C 2 P P 3 = . 9 C 2 + . 7 C 2 + . 4 C 2 . 20 C 2 P P 4 = . 9 C 1 ⋅ . 7 C 1 . 20 C 2 P .

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