有几种方法把数字10写成三个正整数的和呢?这三个数字可以是一样的,但顺序无关紧要.举例来说：10=1+4+5是一个这样的累加,同样10=4+1+5也是这样一个累加
How many ways can the number 10 be written as sum of three p
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