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A bag contains 3 red and 7 black balls. 2 balls are selected at random one by one without replacement.

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A bag contains 3 red and 7 black balls. 2 balls are selected at random one by one without replacement. If the second selected hall happens to be red, what is the probability that the first selected ball is also red ?

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Let E1 : First ball is red, E2 : First ball is black

A : Second ball is red.

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