In the following figure, rectangle represents artists, triangle represents accountants, circle represents social workers and square represents fathers. Which set of letters represents social workers who are NOT fathers?

GAI

The rectangle represents artists,

The triangle represents accountants,

The circle represents social workers

The square represents fathers

Step 1 ) Look at the figure of circle  and outside square

Step 2) Look at  Alphabet given in social workers who are NOT fathers

Step 3) By visual observations we conclude that GAI is the Alphabet which represents social workers who are NOT fathers