To choose 2 students from a class of 20 students, we use combinations since the order in which the students are chosen does not matter.
The formula for combinations is:
- �n is the total number of items.
- �r is the number of items to choose.
In this case, �=20n=20 (total students) and �=2r=2 (students to be chosen).
Step 1: Plug in the values into the formula:
Now, let’s compute the number of ways 2 students can be chosen from a class of 20 students.
In a simplified manner, 2 students can be chosen from a class of 20 students in 190190 different ways.