The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
1 and 3
47
-117
11
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
1 and 3
47
-117
3 and -2 4 and -3 9 and -8
11
41
127
114, 115 & 116
The factor pairs of -3 are (-3,1)(3,-1) Neither of them add up to 5.
the prime factors of 72 are 2 and 3 6,12, and 1 (also factors) sum up to 19
The factors of 360 are... 2, 2, 2, 3, 3, and 5 No matter which way you manipulate these factors they will not equal 39. So no factors of 360 equal 39. But if you take 2,2,3 and 3 they will make 36