1.

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

Answer» 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


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