SOLUTION: A reading list contains 20 articles. How many ways are there to choose 3 articles from the list?
Algebra.Com
Question 411257: A reading list contains 20 articles. How many ways are there to choose 3 articles from the list?
Answer by rfadrogane(214) (Show Source): You can put this solution on YOUR website!
A reading list contains 20 articles. How many ways are there to choose 3 articles from the list?
Sol'n:
This problem is involving a combination,
so,N = nCr = n!/(n-r)!r!
n=20, r=3
N =C(20,3)= 1,140 ways ----answer
^_^
RELATED QUESTIONS
A reading list for a course contains 20 articles. How many ways are there to choose 3... (answered by jim_thompson5910)
A reading list for a course contains 25 articles. How many ways are there to choose three (answered by ewatrrr)
A summer reading list contains 15 titles. In how many ways can 5 titles be chosen from... (answered by ikleyn)
A box of 10 articles contains one that is defective. In how many ways can Ken select 4... (answered by ikleyn)
"There are 6 books on a reading list. Students must read 3 of the books on the list. In... (answered by rothauserc)
There are 6 books on a reading list. Students must read 3 of the books on the list. In... (answered by chndnbl)
How many ways are there to select three math help websites from a list that contains six... (answered by jim_thompson5910)
A reading list for a course in world literature has 20 books on it. How many ways can you (answered by edjones)
There are 6 books on a reading list. Students must read 3 of the books on the list. In... (answered by rwm)