Mathematics, 26.07.2019 06:30 MeowieMeowMeow6500

Ihave an urn with 10 balls, 5 white and 5 black. i extract a ball from the urn. if the ball drawn is black, i put it back in the urn and add one of the same color. if the ball drawn is white i do not put it back in the urn. what is the probability that both balls are white?

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