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You can put this solution on YOUR website!
If B={x e W and x < 5 }and C={x:x e N, 5 < x < 10},
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document.write( "W is the set of WHOLE numbers which are 0,1,2,3,4,5,6,... etc.\r\n" );
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document.write( "B={x e W and x < 5}\r\n" );
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document.write( "So B is the set of whole numbers that are less than 5:\r\n" );
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document.write( "so B = {0,1,2,3,4}\r\n" );
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document.write( "N is the set of NATURAL numbers which are {1,2,3,4,5,6,7,... etc.\r\n" );
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document.write( "C={x:x e N, 5 < x < 10}\r\n" );
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document.write( "So C is the set of natural numbers greater than 5 and also less than\r\n" );
document.write( "10. Or you might say, the ones between 5 and 10, not including \r\n" );
document.write( "5 or 10, \r\n" );
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document.write( "so C = {6,7,8,9}\r\n" );
document.write( "\n" ); document.write( "n(A) and n(B)
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document.write( "[You didn't mention any set A. Was that an error? I will answer \r\n" );
document.write( "n(B) and n(C) instead.]\r\n" );
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document.write( "n(B) and n(C) asks us to count how many there are in the sets \r\n" );
document.write( "B and C.\r\n" );
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document.write( "Since B = {0,1,2,3,4}, n(B) = 5 because it contains 5 elements.\r\n" );
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document.write( "Since C = {6,7,8,9}, n(C) = 4 because it contains 4 elements.\r\n" );
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document.write( "Edwin \n" );
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