1.

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

Answer»

(i) False 

{c,d} is not a subset of A but it belong to A. 

{c,d} ϵ A 

(ii) True 

{c,d} ϵ A 

(iii) True 

{c,d} is a subset of A. 

(iv) It is true that a belong to A. 

(v) False 

a is not a subset of A but it belongs to A 

(vi) True 

(vii) False 

{a,b,e} ⊂ A this is the correct form. 

(viii) False 

{a,b,c} is not a subset of A 

(ix) False 

ϕ is a subset of A. 

ϕ ⊂ A. 

(x) False



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