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Re: Six students in a social studies class will be divided into 3 pairs to [#permalink]
Number of different pairs of students: 6C2 = 15 pairs

Each pair can be assigned 3 countries = 45 different total assignments for pairs

Each pair has 2 students, so 2*45 = 90 total different assignments
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Re: Six students in a social studies class will be divided into 3 pairs to [#permalink]
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