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document.write( "define sets which is are equal equevalent, joint and disjoint?\r\n" );
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document.write( "1. Sets are equal if they contain exactly the same members or elements\r\n" );
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document.write( " {1,3,8,4} is equal to {8,1,4,3}\r\n" );
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document.write( "2. Sets are equivalent if they contain the same NUMBER of members \r\n" );
document.write( " or elements but not necessarily the same members or elements.\r\n" );
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document.write( " (1,3,8,4} is equivalent to {7,8,5,1}\r\n" );
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document.write( "3. Sets are joint if they contain at least one element in common.\r\n" );
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document.write( " {1,3,8,4} and {3,9,1,7} are joint sets.\r\n" );
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document.write( "4. Sets are disjoint if they have no member or element in common.\r\n" );
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document.write( " (1,3,8,4} and (2,4,7,5} are disjoint sets.\r\n" );
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document.write( "Edwin \n" );
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