Question -
Answer -
(i) True
Φ belongs to set A. Hence, true.
(ii) True
{Φ} is an element of set A. Hence, true.
(iii) False
1 is not an element of A. Hence, false.
(iv) True
{2, Φ} is a subset of A. Hence, true.
(v) False
2 is not a subset of set A, it is an element of set A. Hence, false.
(vi) True
{2, {1}} is not a subset of set A. Hence, true.
(vii) True
Neither {2} and nor {1} is a subset of set A. Hence, true.
(viii) True
All three {ϕ, {ϕ}, {1, ϕ}} are subset of set A. Hence, true.
(ix) True
{{ϕ}} is a subset of set A. Hence, true.