In a bag containing 3 black balls and 2 red balls , a ball is picked at random then replaced.



In a bag containing 3 black balls and 2 red balls , a ball is picked at random then replaced. A second ball is chosen.
What is the probability of :I. both balls being black II.one is black ,the other is red.2.in a class of 22 boys and 18 girls , two students are to be selected .What is the probability of selecting two students of the same sex.​




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