Problem
COM-B1-M04-P002 Student and Club
#2
★☆☆☆☆ Level 1 of 5
In a class of \(20\) students, each attends exactly \(2\) clubs. How many pairs \((student,club)\) are there?
Each student contributes two pairs.
There are \(20\cdot2=40\) pairs.
Direct incidence count.