This is a question of combination. In other words, the question requires determination of number of ways in which 12 appetizers can be chosen form a total of 17 appetizers.
Therefore,
Possible number of 12 groups = 17C12 = 17!/[12!*(17-12)!] = 6188
Trick question. It isn't any of the above. Any number divided by 0 is undefined.
Unlike terms I guess meaning a zero pair?
