3.90. There are four numbered balls in a box: 2 white and 2 black. In how many ways can 2 balls be chosen, among which at most one will be black? (a) List all the possibilities. b) Why the number of ways in point a ) cannot be calculated in the following way: we choose one white ball in 1 ways and another ball any of the remaining balls in ways, 1 so together we have 2· 3=6ways?

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A: The solution to the question is attached in the images below.

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A: Given that n{A}=25 and n{B}=31 and n{A ∩B }=20   We have to find n{A∪B}  . We use the union property…

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A: Total number of balls = 12 Number of red balls = 7 Number of green balls = 5

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A: Total number of distinct boxes=n=2 Total number of distinct balls=r=5

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A: Permutation and combinations

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Q: 6. Given the following statistics, what is the probability that a woman has cancer if she has a…

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Q: I have a bag containing 40 blue marbles and 60 red marbles. I choose 4 marbles (without replacement)…

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A: Explanation of the answer is as follows

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