Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that first ball is black and second is red.

Total number of balls = 18 Number of red balls = 8 Number of black balls = 10 Probability of getting first ball black =10 18 =5 9 The ball is replaced after the first draw. Probability of getting second ball as red =8 18 =4 9 Therefore, probability of getting first ball as black and second ball as red =5 9 4 9 =20 81

Two balls are drawn at random with replacement from a box contain…

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