document.write( "Question 1105633: The probability of a man to live 20 more years is X and the probability of his wife to live 20 more years is Y.
\n" ); document.write( "1) find the probability of both to live 20 more years.
\n" ); document.write( "2) find the probability of at least one person to live 20 more years.
\n" ); document.write( "3) find the probability of only the man to live 20 more years
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Algebra.Com's Answer #720509 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "1)  1 - (1-X)*(1-Y) = X + Y - XY.\r\n" );
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document.write( "2)  X*(1-Y) + Y*(1-X) = X + Y - 2*XY.\r\n" );
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document.write( "3)  X*(1-Y).\r\n" );
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