If M = x : x ∈ N and x < 3 , then M has _____ proper subsets. - Vidyadip

Question

If $M = {x : x ∈ N$ and $x < 3$}, then M has _____ proper subsets.

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Answer

If M = {x: x ∈ N and x < 3}, = {1, 2}
Then M has proper subsets $= 2^2 - 1 = 4 - 1 = 3$

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