document.write( "Question 469918: A coin is flipped twice. What is the probability that one head and one tail will occur? \n" ); document.write( "
Algebra.Com's Answer #322368 by Edwin McCravy(20055)\"\" \"About 
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A coin is flipped twice. What is the probability that one head and one tail will occur?\r
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document.write( "P[(head 1st AND tail 2nd) OR (tail 1st AND head 2nd)]\r\n" );
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document.write( "AND means to multiply probabilities and OR means to ADD probabilities\r\n" );
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document.write( "P(heads 1st)×P(tails 2nd) + P(tails 1st)×P(heads 2nd)\r\n" );
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document.write( "All the probabilities are \"1%2F2\", so\r\n" );
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document.write( "\"1%2F2\"×\"1%2F2\" + \"1%2F2\"×\"1%2F2\" = \"1%2F4\" + \"1%2F4\" = \"2%2F4\" = \"1%2F2\"\r\n" );
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document.write( "Edwin

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