If, A = {1,2,3,4} then A − A = _____?

{1,2,3,4}

{0,5}

{}

None of these

Step 1: Recall the definition of set difference

The set difference A - B is the set of elements that are in A but not in B.

Step 2: Calculate A - A

A = {1,2,3,4}

A - A = {} (since every element in A is also in A, the difference is the empty set)