The first one is roster method or listing method. The second one is verbal description method and the third one is set builder notation.
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there are several ways of representing a set if our collection does not contain a very large Numbers's may use roster notation to describe it.
Any 3 out of 4 = 4. Each set can be arranged 6 ways so 24 different numbers.
(1) description (2) roster form (3) set-builder notation
Well, isn't that a happy little question! To calculate numbers in a math data set, you can start by finding the mean, which is the average of all the numbers. Then, you can find the median, which is the middle number when the data set is ordered from smallest to largest. And finally, you can find the mode, which is the number that appears most frequently in the data set. Just remember, there are many ways to appreciate the beauty of numbers!
real numbers