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A bag has 7 green balls and 3 red balls. Suppose two friends, A and B, take turns in order to draw without replacement from

A bag has 7 green balls and 3 red balls. Suppose two friends, A and B, take turns in order to draw without replacement from the urn. The first one to draw a green ball without replacement wins

a) What is the probability that A wins?

b) What is the probability that A wins if they draw the balls with replacement.

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