document.write( "Question 1157705: A bag contains 3 red marbles and 4 white marbles. Two marbles are drawn in succession without replacement. Find the probability the first marble drawn is red and the second is white. Find the probability Both marbles drawn are red. \n" ); document.write( "

Algebra.Com's Answer #780578 by math_helper(2461) $\"\"$ $\"About$

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One two draws w/o replacement, there are four possibilities:\r
\n" ); document.write( "\n" ); document.write( "RR
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document.write( "P(RR) = (3/7)(2/6) = 6/42     <<< ans (b)\r\n" );
document.write( "P(RW) = (3/7)(4/6) = 12/42    <<< ans (a)\r\n" );
document.write( "P(WR) = (4/7)(3/6) = 12/42\r\n" );
document.write( "P(WW) = (4/7)(3/6) = 12/42\r\n" );
document.write( "            total  = 42/42  (ok)\r\n" );
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