In the following diagram, the triangle represents 'actors‘. the circle represents ‘instrumentalists’ and the rectangle represents ‘dancers’. The numbers in different segments show the number of persons.

How many dancers are instrumentalists but not actors ?

Options

A. 17
B. 12
C. 20
D. 21

Answer

A

Explanation

According to Venn diagram .
Total number of dancers who are instrumental but not actors =(8 + 9) = 17