. An examination has four papers. Each paper has a maximum of n marks
Find the number of ways in which an examinee can secure 2n marks in the examination.
Answer: An examinee can secure marks 0,1,2,......,n in a paper and the sum of the marks secured in four papers should be 2n.
the required number of ways
=the number of ways to distribute 2n marks over four papers having maximum n marks each