n members from n identical and 2n+1 different
Source: 10th QEDMO p4 Juniors (8-10. 12. 2011) https://artofproblemsolving.com/community/c1512515_qedmo_200507
May 16, 2021
combinatorics
Problem Statement
In year the QED has members, of which are identical robots and (uncloned and therefore distinguishable) people. For the board election in Wurzburg there will be exactly members. Find out how many distinguishable compositions are conceivable for this.