document.write( "Question 696631: Determine the sets A, B where A − B {1, 3, 7, 11},I am not sure what is being asked with this question or where to begin to solve this. \n" ); document.write( "
Algebra.Com's Answer #429178 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "A, B where A - B = {1, 3, 7, 11}\r\n" );
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document.write( "You haven't given all the information.  If you'll check your book\r\n" );
document.write( "I think you will find something you left out.\r\n" );
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document.write( "Set subtraction:\r\n" );
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document.write( "A - B means to start with set A and take out any elements that A\r\n" );
document.write( "has in it that are elements of B.  \r\n" );
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document.write( "For instance, let\r\n" );
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document.write( "A = {1,2,3,5,6,7,10,11,12}\r\n" );
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document.write( "and\r\n" );
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document.write( "B = {2,4,5,6,8,10,12,13}\r\n" );
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document.write( "then\r\n" );
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document.write( "A - B = {1,2,3,5,6,7,10,11,12} - {2,4,5,6,8,10,12,13} = {1,3,7,11}\r\n" );
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document.write( "Because we removed all the elements from A that were elements of B.\r\n" );
document.write( "Note that we couldn't take 4, 8 and 13 out of A for A does not contain\r\n" );
document.write( "them, so we just ignore them. \r\n" );
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document.write( "Edwin
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