document.write( "Question 99847: We cannot get the correct answer to this probability question: A bag contains red & blue marbles. you pick 2 marbles at random without replacing the first one. The probability of drawing a blue and then a red is 4/15. The probability that your second marble is red if your first is blue is 2/3. Find the probability the first marble is blue. \n" ); document.write( "

Algebra.Com's Answer #72682 by stanbon(75887) $\"\"$ $\"About$

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A bag contains red & blue marbles. you pick 2 marbles at random without replacing the first one. The probability of drawing a blue and then a red is 4/15. The probability that your second marble is red if your first is blue is 2/3. Find the probability the first marble is blue.
\n" ); document.write( "----------
\n" ); document.write( "P(red and blue) = P(red | blue}*P(b)
\n" ); document.write( "4/15 = (2/3)*P(b)
\n" ); document.write( "P(blue) = (4/15)*(3/2) = 2/5
\n" ); document.write( "==================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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