One Line Answer
If M = {x : x ∈ N and x < 3}, then M has _____ proper subsets.
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Solution
If M = {x: x ∈ N and x < 3}, = {1, 2}
Then M has proper subsets = 22 - 1 = 4 - 1 = 3
Concept: Concept for Revision Idea of Sets
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