1.

Let A = {ϕ {ϕ}, 1, {1, ϕ}, 2}. Which of the following are true ? (i) ϕ ϵ A (ii) {ϕ} ϵ A (iii) {1} ϵ A (iv) {2, ϕ} ⊂ A (v) 2 ⊂ A (vi) {2, {1}} ⊈ A (vii) {{2}, {1}}, ⊈ A (viii) { ϕ, {ϕ} , {1, ϕ}} ⊂ A (ix) {{ ϕ}} ⊂ A.

Answer»

Let A = {ϕ {ϕ}, 1, {1, ϕ}, 2}. Which of the following are true ?

(i) ϕ ϵ A (ii) {ϕ} ϵ A

(iii) {1} ϵ A (iv) {2, ϕ} A

(v) 2 A (vi) {2, {1}} A

(vii) {{2}, {1}}, A

(viii) { ϕ, {ϕ} , {1, ϕ}} A

(ix) {{ ϕ}} A.



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