Write down all possible proper subsets of the following set

(ii) { $1, 2, 3$ }

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Solution

Given set is { $1, 2, 3$ }
Subsets of given set are,

{ $1$ }, { $2$ }, { $3$ }, { $1, 2$ }, { $2, 3$ }, { $3, 1$ }, { $1, 2, 3$ }, $ϕ$

So, proper subsets of { $1, 2, 3$ } are,

{ $1$ }, { $2$ }, { $3$ }, { $1, 2$ }, { $2, 3$ }, { $3, 1$ }, $ϕ$

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