document.write( "Question 843356: a bag contains 8 red marbles, 7 blue marbles, and 5 green marble. Two marbles are randomly selected from the bag, what is the probability that both are NOT blue? \n" ); document.write( "

Algebra.Com's Answer #508204 by Fombitz(32388) $\"\"$ $\"About$

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Let's find the probability that both are blue since P(both blue)+P(both not blue)=1.
\n" ); document.write( "I'm assuming it's without replacement.
\n" ); document.write( " $\"P%281B%29=7%2F%288%2B7%2B5%29=7%2F20\"$
\n" ); document.write( "and the second,
\n" ); document.write( " $\"P%282B%29=6%2F19\"$
\n" ); document.write( "So then
\n" ); document.write( " $\"P%28B%2CB%29=%287%2F20%29%286%2F19%29=%287%2F10%29%283%2F19%29=21%2F190\"$
\n" ); document.write( "So then the probability we want is,
\n" ); document.write( " $\"P=1-21%2F190=190%2F190-21%2F190=169%2F190\"$
\n" ); document.write( " \n" ); document.write( "

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