document.write( "Question 1196711: Urn 1 contains 7 red balls and 4 black balls. Urn 2 contains 4 red balls and 1 black ball. Urn 3 contains 5 red balls and 3 black balls. If an urn is selected at random and a ball is drawn, find the probability that it will be red. \n" ); document.write( "

Algebra.Com's Answer #829688 by ikleyn(52790) $\"\"$ $\"About$

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\n" ); document.write( "Urn 1 contains 7 red balls and 4 black balls.
\n" ); document.write( "Urn 2 contains 4 red balls and 1 black ball.
\n" ); document.write( "Urn 3 contains 5 red balls and 3 black balls.
\n" ); document.write( "If an urn is selected at random and a ball is drawn, find the probability that it will be red.
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\n" ); document.write( "\n" ); document.write( " I came to fix incorrect writing (typos ?) in the post by @math_helper.\r
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document.write( "    P(red) =  +  +  = \r\n" );
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document.write( "           =  =  = \r\n" );
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document.write( "           =  = .    ANSWER\r\n" );
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