Question -
Answer -
(i) False
{c, d} is not a subset of A but it belong to A.
{c, d} ∈ A
(ii) True
{c, d} ∈ A
(iii) True
{c, d} is a subset of A.
(iv) It is true that a belongs to A.
(v) False
a is not a subset of A but it belongs to A
(vi) True
{a, b, e} is a subset of A.
(vii) False
{a, b, e} does not belong to A, {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
{ϕ} is not subset of A, ϕ is a subset of A.