Factors of 21 are 1, 3, 7, and 21; the factor pairs are (1 x 21) and (3 x 7).
There are 3 factor pairs of 63: 63 = 1 x 63 63 = 3 x 21 63 = 7 x 9
1 x 21, 3 x 7, 7 x 3, 21 x 1
1 and 189, 3 and 63, 7 and 27, 9 and 21
(1, 63) (3, 21) (7, 9)
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
There are two factor pairs of 21: 21 = 1 x 21 21 = 3 x 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)
(21,-1)(7,-3)(-21,1)(-7,3)
(21,1)(7,3) (42,1)(21,2)(14,3)(7,6) Since 21 is a factor of 42, all the factors of 21 will be included in the factor pairs of 42.
There are 3 factor pairs of 63: 63 = 1 x 63 63 = 3 x 21 63 = 7 x 9