document.write( "Question 634455: I have only this question left. If anyone can help me with this, I will be so happy, and I can close the math book, and take a Tylenol. Thank you so much. I appreciate all that you all do to help us with the things that we do not understand. Bless you.\r
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Algebra.Com's Answer #399616 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
L = {x l x is an integer between 20 and 40, inclusive}\r
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\n" ); document.write( "\n" ); document.write( "L = {20, 21, 22, 23, ... , 35, 36, 37, 38, 39, 40}\r
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\n" ); document.write( "\n" ); document.write( "So we're trying to count all the integers from 20 to 40 (including both 20 and 40). So we can use the handy shortcut\r
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\n" ); document.write( "\n" ); document.write( "Number of numbers from X to Y = Y - X + 1\r
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\n" ); document.write( "\n" ); document.write( "Number of numbers from 20 to 40 = 40 - 20 + 1\r
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\n" ); document.write( "\n" ); document.write( "Number of numbers from 20 to 40 = 21\r
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\n" ); document.write( "\n" ); document.write( "So the cardinality of set L is 21
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