1.

Two similar boxes B_(i) (i-=1,2) contain(i+1) red and (5-i-1) black balls. One box is chosen at random and two balls are drawn randomly. What is the probability that both the balls are of different colours?

Answer»

`(1)/(2)`
`(3)/(10)`
`(2)/(5)`
`(3)/(5)`

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