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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

## 1 Answer

Best answer
Sets are unordered in nature. So answer will be D.

### 3 Comments

but set is a collection of distinct objects
C is multiset, not set.

@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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