(68, 1) (34, 2) (17, 4)
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1*68=68,2*34=68,and 17*4=68
(68,1)(34,2)(17,4)
These are the 16 factor pairs for the number 1,080:1080,1540,2360,3270,4216,5180,6135,8120,9108,1090,1272,1560,1854,2045,2440,2736,30
68 34,2 17,2,2
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.