document.write( "Question 1177964: A new computer virus can enter the system through e-mail or through the internet. There
\n" ); document.write( "is a 30% chance of receiving this virus through e-mail. There is a 40% chance of
\n" ); document.write( "receiving it through the internet. Also, the virus enters the system simultaneously
\n" ); document.write( "through e-mail and the internet with probability 0.15. What is the probability that the
\n" ); document.write( "virus does not enter the system at all?
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Algebra.Com's Answer #807122 by ikleyn(52800) $\"\"$ $\"About$

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document.write( "The probability that the virus will enter the computer via Email OR the Internet is\r\n" );
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document.write( "    p = 0.3 + 0.4 - 0.15 = 0.55.\r\n" );
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document.write( "The probability that the virus will not enter the computer at all is the complement to it, \r\n" );
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document.write( "which is  P' = 1 - P = 1 - 0.55 = 0.45.      ANSWER\r\n" );
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