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.
What is the cardinality of the set L = {x l x is an integer between 20 and 40, inclusive}?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! L = {x l x is an integer between 20 and 40, inclusive}
L = {20, 21, 22, 23, ... , 35, 36, 37, 38, 39, 40}
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
Number of numbers from X to Y = Y - X + 1
Number of numbers from 20 to 40 = 40 - 20 + 1
Number of numbers from 20 to 40 = 21
So the cardinality of set L is 21
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