Let A = {a, b, {c, d}, e}. Which of the following are false and why ?

1.	Let A = {a, b, {c, d}, e}. Which of the following are false and why ? (i) {c, d} ⊂ A (ii) {c, d} ϵ A (iii){{c, d} ϵ A } (iv) a ϵ A (v) a ⊂ A (vi) {a, b, e} ⊂ A (vii) {a, b, e} ϵ A (viii) {a, b, c} ϵ A (ix) ϕ ϵ A (x) { ϕ } ⊂ A
Answer» Let A = {a, b, {c, d}, e}. Which of the following are false and why ? (i) {c, d} $\subset$ A (ii) {c, d} $ϵ$ A (iii){{c, d} $ϵ$ A } (iv) a $ϵ$ A (v) a $\subset$ A (vi) {a, b, e} $\subset$ A (vii) {a, b, e} $ϵ$ A (viii) {a, b, c} $ϵ$ A (ix) $ϕ$ $ϵ$ A (x) { $ϕ$ } $\subset$ A

Let A = {a, b, {c, d}, e}. Which of the following are false and why ? (i) {c, d} ⊂ A (ii) {c, d} ϵ A (iii){{c, d} ϵ A } (iv) a ϵ A (v) a ⊂ A (vi) {a, b, e} ⊂ A (vii) {a, b, e} ϵ A (viii) {a, b, c} ϵ A (ix) ϕ ϵ A (x) { ϕ } ⊂ A

Answer»

(i) {c, d} $\subset$ A (ii) {c, d} $ϵ$ A (iii){{c, d} $ϵ$ A }

(iv) a $ϵ$ A (v) a $\subset$ A (vi) {a, b, e} $\subset$ A

(vii) {a, b, e} $ϵ$ A (viii) {a, b, c} $ϵ$ A (ix) $ϕ$ $ϵ$ A (x) { $ϕ$ } $\subset$ A