1 votes 1 votes suppose 5 people are to be randomly selected from a group of 20 individuals consisting of 10 married couples, and we want to determine P(N), the probability that the 5 chosen are all unrelated. (That is, no two are married to each other.)? himgta asked Nov 2, 2018 himgta 887 views answer comment Share Follow See all 10 Comments See all 10 10 Comments reply Show 7 previous comments Utkarsh Joshi commented Nov 2, 2018 reply Follow Share As i said you are counting permutations which is not required. 0 votes 0 votes Utkarsh Joshi commented Nov 2, 2018 reply Follow Share According to your approach, ABCDE and BACDE are different but we just want the number of selections and not permutations. 0 votes 0 votes himgta commented Nov 3, 2018 reply Follow Share Thanks @Utkarsh Joshi brother! 0 votes 0 votes Please log in or register to add a comment.