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4.划分所谓正整数n的部分数为r的划分就是r个正整数的集合,它们的和等于n。例如,7的部分数为3的划分恰好有4个,它们是:
4. Dividing the part of the so-called positive integer n The division of r is the set of r positive integers, whose sum is equal to n. For example, there are exactly 4 divisions for a part number of 7 of 3, which are: