Question 19

Explanation

Let:

• $n(S)$ = Total number of students in the class
• $n(P)$ = Number of students in scouts
• $n(F)$ = Number of students in futsal

Given:

The number of students who do not participate in either ($n(P \cup F)^c$) can be found using the universal set formula:

Substitute the known values:

Thus, the number of students who do not join scouts and futsal extracurriculars is $10$.