document.write( "Question 1053378: A bag containing 5 white, and 7 black balls. All of the balls are drawn at random from the bag one by one without replacement. Find the probability of drawing white ball on 6th attempt and the previous 3 balls being black. \n" ); document.write( "
Algebra.Com's Answer #668622 by ewatrrr(24785)![]() ![]() You can put this solution on YOUR website! 12 balls: 5 white, and 7 black balls \n" ); document.write( "P(?, ? , B,B,B , W) = \n" ); document.write( "P(W, W , B,B,B , W) + \n" ); document.write( "P(B, B , B,B,B , W) + \n" ); document.write( "P(B, W , B,B,B , W) + \n" ); document.write( "P(W, B , B,B,B , W) \n" ); document.write( "P = (5/12)(4/11)(7/10)(6/9)(6/8)(3/7) + (7/12)(6/11)(5/10)(4/9)(3/8)(5/7) \n" ); document.write( "+ (7/12)(5/11)(6/10)(5/9)(4/8)(4/7) + (5/12)(7/11)(6/10)(5/9)(4/8)(4/7) \n" ); document.write( "P = |