If A = {1,2,3,4,6} B= {2,4,5,7} then B-A =?

If A = {1,2,3,4,6} B= {2,4,5,7} then B-A =?

Explanation

If A = {1,2,3,4,6} B= {2,4,5,7} then B-A =?

{2,4,5,7} -  {1,2,3,4,6}

 B - A means B contains the element which is not present in A. 

{3,5,7}