The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
21,17,3
(21,1)(7,3)
1, -1, 3, -3, 7, -7, 21, -21
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
-21 and 1 -7 and 3 -3 and 7 -1 and 21
There are two factor pairs of 21: 21 = 1 x 21 21 = 3 x 7
1 and 17
Aside from itself (21), the highest integer factor of 21 is 7.
Factors of 21 are 1, 3, 7, and 21; the factor pairs are (1 x 21) and (3 x 7).
1 & 21, and 3 & 7
1 and 21, 3 and 7,
(1, 21) (3, 7)
1,21 3,7
21,17,3
(21,1)(7,3)