- #1
Rijad Hadzic
- 321
- 20
Homework Statement
Write out the following set by listing its elements between braces:
{X : X ⊆ {3,2,a} and |X| = 4}
Homework Equations
The Attempt at a Solution
My book tells me that it is ∅, but couldn't X have repeated elements? so X = {3,2,a,3}, {3,2,a,2} etc for example??