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Diana has a box containing 3 red and 2 green marbles. She selects 2 marbles at random. Find the probability if she replaces the 1st marble before she draws the second?
Wiki User
∙ 16y ago
With replacement, the odds of the second extraction do not change after the first, because of independence of the two extractions. Hence, the probability of extracting two reds is (3/5)*(3/5), the probability of two greens is (2/5)*(2/5) and that of one red and one green is 2*(3/5)*(2/5).
Wiki User
∙ 16y ago
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You are supplied with a filter that selects a wavelength of 520 nm?
Good. And that is the question?
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