Question

Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that(i)         both balls are red.(ii)        first ball is black and second is red.(iii)       one of them is black and other is red.

Answer 1

Given that , Total balls `= 18`
(i) `P(red) = 8/18*8/18=16/81`
(ii) probability`=10/18*8/18= 20/81`
(iii) probability= `(10/18*8/18) + (8/18*10/18)`
`=40/81`