Probability tree diagram: without replacement

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thank you so much:)
you explain better than my maths teacher does!

angelinascanlan
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An urn contains 10 marbles: 5 red and 5 green. Let X denote number of red marbles out of 2 marbles drawn without replacement from an urn. Then P(X=1) is





Can u pls solve it

saurabhmaurya
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