In how many ways 2 students can be chosen from the class of 20 students?
- 180
- 190
- 240
- None of these
Explanation
The number of ways to choose 2 students from a class of 20 students is represented by the combination formula:
C(20,2) = 20! / (2! x (20-2)!)
where ! denotes the factorial function.
Simplifying the formula, we get:
C(20,2) = (20 x 19) / 2
= 190
So, there are 190 ways to choose 2 students from a class of 20 students.
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