write down all the subset of the following a
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We know that number of subsets of any set is 2
n
where n is the number of elements in that set.
Every non-empty set has two subsets ϕ and the set itself.
(i) The subsets of {a} are ϕ and {a}.
(ii) The subsets of {a,b} are ϕ,{a},{b},and{a,b}.
(iii) The subsets of {1,2,3} are ϕ,{1},{2},{3},{1,2},{2,3},{1,3},and{1,2,3}
(iv) The only subset of ϕ is ϕ.
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