A box has 6 black, 4 red, 2 white and 3 blue shirts. What is probability of picking at least 1 red shirt in 4 shirts that are randomly picked?
Answer: 2291
Explanation
Total shirts = 15, Red shirts = 4P(at least 1 red) = 1 - P(no red)
P(no red) = 11C4 / 15C4 = 330 / 1365
P(at least 1 red) = 1 - 330/1365 = 1035 / 1365 = 2291
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