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A bag contains 5 black balls, 4 white ba...

A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomwise the probability that it is black or red ball is a. 1/3            b. 1/4            c. /12          d. 2/3

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Total cases `= 12_(C_1) = 12`
Favourable cases `= 5_(C_1) + 3_(C_1) = 5+3 = 8`
Hence, the required probability `= 8/12 = 2/3.`
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