Question

then
• If A = {1,2,3} and
B = {2, 3, 4} then
A-B = ?​

Answer 1

The common elements are 2, 3.

We need A-B. Find the elements of A except common.

A-B={1}

Answer 2

Answer :

Subtraction of sets :

A minus B is eleminating elements of set B from A.

A - B = {x:x $\in$A $\notin$B}

→ A - B = { 1, 2, 3 } - { 2, 3, 4 }

→ A - B = { 1 }