Mathematics
Mathematics
Problem
3. Let A={1,2,{3,4},5}. Which of the following statements are incorrect and why?
(i) {3,4}⊂A
(ii) {3,4}∈A
(iii) {{3,4}}⊂A
(iv) 1∈ A
(v) 1⊂ A
(vi) {1,2,5}⊂A
(vii) {1,2,5}∈A
(viii) {1,2,3}⊂A
(ix) ϕ∈A
(x) ϕ⊂A
(xi) {ϕ}⊂A
(i) {3,4}⊂A
(ii) {3,4}∈A
(iii) {{3,4}}⊂A
(iv) 1∈ A
(v) 1⊂ A
(vi) {1,2,5}⊂A
(vii) {1,2,5}∈A
(viii) {1,2,3}⊂A
(ix) ϕ∈A
(x) ϕ⊂A
(xi) {ϕ}⊂A
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