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monroe17

Find n(A) of the following set A={101,102,103,104,...,121}

  • one year ago
  • one year ago

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  1. jim_thompson5910
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    n(A) = number of items in set A So how many elements are in set A?

    • one year ago
  2. jim_thompson5910
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    In other words, how many whole numbers are there from 101 to 121?

    • one year ago
  3. monroe17
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    21?

    • one year ago
  4. jim_thompson5910
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    good, you got it

    • one year ago
  5. jim_thompson5910
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    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.

    • one year ago
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