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A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected random wise, the probability that it is black or red ball is

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Three integers are chosen at random from the first 20 integers. The probability that their product is even is

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Out of 30 consecutive integers, 2 are chosen at random. The probability that their sum is odd, is

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Two dice are thrown simultaneously. The probability of getting a pair of aces is

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An urn contains 9 balls two of which are red, three blue and four black. Three balls are drawn at random. The probability that they are of the same colour is