document.write( "Question 1207265: An urn contains 7 red marbles, 6 white marbles, and 8 blue marbles marbles. A child randomly selects three (without replacement) from the urn. Round to four decimal places.\r
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Algebra.Com's Answer #845038 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "An urn contains 7 red marbles, 6 white marbles, and 8 blue marbles.
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\n" ); document.write( "\n" ); document.write( "(a)Find the probability all three marbles are the same color.\r
\n" ); document.write( "\n" ); document.write( "(b) Find the probability that none of the three marbles are white.
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document.write( "(a)  In (a), the probability is the sum of the probabilities of three disjoint events:\r\n" );
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document.write( "     P = P(all three marbles are red) + P(all three marbles are white) + P(all three marbles are blue) = \r\n" );
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document.write( "       =  +  +  = 0.0835  (rounded).\r\n" );
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document.write( "     Here  21 = 7 + 6 + 8 is the total marbles.\r\n" );
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document.write( "     The structure of the formula is clear, and the structure reflects its meaning.\r\n" );
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document.write( "(b)  P =  = 0.3421  (rounded).\r\n" );
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document.write( "     Here  15 = 7+8  is the number of all non-white marbles.\r\n" );
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document.write( "     Again, the structure of the formula is clear, and the structure reflects its meaning.\r\n" );
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