Question: Suppose that 3 balls are chosen without replacement from an urn consisting of 7 white and 4 red balls. Let Xi equal 1 if the

Suppose that 3 balls are chosen without replacement from an urn consisting of 7 white and 4 red balls.

Let Xi equal 1 if the i th ball selected is white, and let it equal 0 otherwise.

Find the probability that X1+X2+X3=2.

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