Given the following question:
We have 6 family members
We have 9 friends
We are only allowed to take five of these firends/family, since we are trying to find the probability of you taking 2 family members, and 3 of your friends we have to..
6 + 9 = 15
Where the 5 represents the attendees and the 5 (3 and 2) represent the probability of the 5 you will take to france are friends or family.