document.write( "Question 294029: Determine which, if any, of the three statements are equivalent.
\n" ); document.write( "I) If there is no food left on the table, then we have had dinner.
\n" ); document.write( "II) If we have had dinner, then there is no food left on the table.
\n" ); document.write( "III) If there is food left on the table, then we have not had dinner.\r
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\n" ); document.write( "\n" ); document.write( " I, II, and III are equivalent
\n" ); document.write( " I and II are equivalent
\n" ); document.write( " II and III are equivalent
\n" ); document.write( " I and III are equivalent
\n" ); document.write( " None are equivalent
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\n" ); document.write( "

Algebra.Com's Answer #212131 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
Contrapositives are equivalent.
\n" ); document.write( "Switch the arguments and negate both
\n" ); document.write( "I If there is no food left on the table, then we have had dinner.
\n" ); document.write( ".....If we have not had dinner, then there is food left on the table\r
\n" ); document.write( "\n" ); document.write( "II) If we have had dinner, then there is no food left on the table.
\n" ); document.write( "III) If there is food left on the table, then we have not had dinner.
\n" ); document.write( "II and III are contrapositives and are equivalent.
\n" ); document.write( "This was also answered in January
\n" ); document.write( "http://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.263278.html
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