Exercise 3.2.1: Sets of sets - true or false.

Let X = {1, {1}, {1, 2}, 2, {3}, 4 }. Which statements are true?

(f)

{1, 2} X

(g)

{2, 4} X

(h)

{2, 4} X

(i)

{2, 3} X

(j)

{2, 3} X

(k)

|X| = 7