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A bag contains 10 white and 15 black bal...

A bag contains `10` white and `15` black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?

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Probability atleast 4 of the balls are white=> probability(4 balls are white)+probability(5 balls are white)
=>`(.^5C_4)2/6xx2/6xx2/6xx4/6+2/6xx2/6xx2/6xx2/6=11/243`
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