engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Probability Addition Theorem of Events
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?
1
1/2
2
3/10
3
2/5
4
3/5