document.write( "Question 1176176: one of two urns chosen at random with one as likely to be chosen as the other . Then a ball is withdrawn from the chosen urn . urn 1 contains 1 white ball and 5 red balls, urn 2 has 5 white balls and 1 red ball if a white ball is drawn what is the probability it came from urn 2 \n" ); document.write( "
Algebra.Com's Answer #802483 by ewatrrr(24785)\"\" \"About 
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document.write( "U1 = 1W & 5R   and  U2 has 5W & 1R\r\n" );
document.write( "Ball withdrawn:\r\n" );
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document.write( "P( U2| W) = P(U2 and W)/P(W) =\r\n" );
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