(i) {2, 3, 4} ⊂ {1, 2, 3, 4, 5}
(ii) {a, e, o} ⊄ {a, b, c}
(iii) Many triangles are possible in a plane.
So, {x: x is an equilateral triangle in a plane} ⊂ (x : x is a triangle in a plane}
(iv) First set in the tabular form is (1, 2, 3, 4,….} and second set in the tabular form is {…… -3, -1, 0, 1, 3, 5,..}.
So, (x : x is a natural number} ⊄ {x : x is an odd whole number}.