1.

Two similar boxes Bi (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?

A. 1/2
B. 3/10
C. 2/5
D. 3/5
Answer» E.


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