anonymous
  • anonymous
Find n(A) of the following set A={101,102,103,104,...,121}
Mathematics
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SOLVED
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chestercat
  • chestercat
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jim_thompson5910
  • jim_thompson5910
n(A) = number of items in set A So how many elements are in set A?
jim_thompson5910
  • jim_thompson5910
In other words, how many whole numbers are there from 101 to 121?
anonymous
  • anonymous
21?

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jim_thompson5910
  • jim_thompson5910
good, you got it
jim_thompson5910
  • jim_thompson5910
You can either count them out, or you can use the trick Last number - First number + 1 = 121 - 101 + 1 = 21 Either way gives you a count of 21.

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