Weekly service

In the class are 20 pupils. How many opportunities have the teacher selected two pupils who will have a week-class service randomly?

Correct answer:

n =  190

Step-by-step explanation:

n=C2(20)=(220)=2!(202)!20!=212019=190



Did you find an error or inaccuracy? Feel free to write us. Thank you!



avatar







Tips to related online calculators
Would you like to compute count of combinations?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: