in Set Theory & Algebra
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1 vote
1 vote

The set $\{1,2,3\}$ is equal to

  1. $\{2,1,3\}$    
  2. $\{3,2,1\}$  
  3. $\{1,2,3,1\}$   
  4. All of the above
in Set Theory & Algebra
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1 Answer

4 votes
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Best answer
Sets are unordered in nature. So answer will be D.
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3 Comments

but set is a collection of distinct objects
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C is multiset, not set.
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@jason_Roy
Wikipedia says:
In mathematics, a multiset (or bag) is a generalization of the concept of a set that, unlike a set, allows multiple instances of the multiset's elements. For example, {aab} and {ab} are different multisets although they are the same set. However, order does not matter, so {aab} and {aba} are the same multiset.

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