In an auditorium, 360 chairs are to be set up in a rectangular arrangement with x rows c exactly y chairs each. If the only other restriction is that 10 < x < 25, how many different rectangular arrangements are possible?
Four
Five
Six
Eight
Nine
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0个质因数组合:1
1个质因数组合:2,3,5
2个质因数组合:4,6,10,9,15
3个质因数组合:8,12,40,18,30,45
4个质因数组合:24,40,36,60,90
5个质因数组合:72,120,180
6个质因数组合:360
总共可以组合出24个因数,大于10小于25的有15,12,20,18,24共5个。
因为要排成长方形,所以不能排成360排*1把,那是一条直线。