Arrange 7 people into group(s) such that a group must have at least 3 people?

7 people can be divided into 2 groups, the first group having 4 people; and the second group having 3 people.

the battle of gettysburg is considered the "high water mark" of the confederacy because it marked the greatest advance of the confederate forces against the union.

the answer is 5/14.

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