Question 1048588
Group of 14
Qistina and Fahmi insist on serving together or not at all
Then 14-2 = 12 
How many groups of 3 can Qistina and Fahmi serve with?
12C3
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Because a team that contains both Qistina and Fahmi contains exactly 3 other people from the remaining 12 in the group, 
there are as many such teams as there are subsets of 3 people that can be chosen from the remaining 12.