Write proper subsets of $A = {a, b}$

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Solution

A proper subset has atleast one element less than the original set.
So proper Subsets formed from the set $A =$ { $a, b$ } can be { { $ϕ$ } ; { $a$ } ; { $b$ }}

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Similar questions

B = {a, b, c}

When is A called proper subset of B?

Write down all possible proper subsets each of the following sets:
(i) ${1, 2}$
(ii) ${1, 2, 3}$
(iii) ${1}$ .

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