Question

two halls are drawn at random with replacement from a box containing 10balck and 8 red balls find the probability that I) both balls are red II) 1st ball is black and 2nd ball is red iii) one of them is black and other one is red​

Answer 1

Answer:

a) 1/9     b) 1/80     c) 18/80

Step-by-step explanation:

a) both balls are red

prob of red balls = 2/18

                            = 1/9

b) first is black and second is red

prob of black and red balls = (1/10) x (1/8)

                             = 1/80

c) one of them is black and one is red

   = (1/10) + (1/8)

   = 18/80