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Question on Permutation and Combination

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Dear all,

Need your kind help in solving this question below. Your help is very much appreciated.

Four friends attend different schools, and each brings two classmates to a quiz evening. The quiz is for teams of 6, so the group make up two teams.
i) How many different pairs of teams are possible if students at the same school are always on the same team?

ii) How many different pairs of teams are possible if the four friends are all on one team?

iii) How many different pairs of teams are possible if each team includes at least one student from each school?
 
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