Question: A teacher must divide 30 students into two groups. Group 1 has 12 people and Group 2 has 18 people. Jack and Jill are friends

A teacher must divide 30 students into two groups. Group 1 has 12 people and Group 2 has 18 people. Jack and Jill are friends and they want to be in the same group. Find how many groups are there with both in the same group?

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