In how many ways can the committee be selected if the girls must include either Roberta or Priya but not both?
65260
In how many ways can you select one of the two but not both?
131940
Why weren't Ron and Hermione allowed to enter the Three Broomsticks?
136830
Rules to decide which wonder side (A or B) to play in 7 Wonders?
43076
Chess tournament combinatorics
140350
Will my vote be valid if I only use one of the three in the moderator election?
154000
Select player that does not have a specific score set
132229
In how manys can a programming team and a hacking team be selected if Jack does not serve on both teams?
121871
In how many ways can 5 boys and 3 girls be seated in a row such that no two girls are together?
25421
Simple or not simple Groups
44853
Can the Doctor be female?
110436
ways to select a non-empty subset of these people, such that no two adjacent people are selected.
53990
Group with more than one element and with no proper, nontrivial sub groups must have prime order.
114642
There is/are for multiple subjects
15525
Can 12 teams in 6 disciplines play 6 rounds without repetition?
69748
Semi-Ambiguous Combinatorics Problem
97207
How to determine which item/role mechanic overrules another, if they contradict each other?
126297
A high school Olympiad problem