30,115,210,36,5
(15,2)(10,3)
1,30 2,15 3,10 5,6
(30,1)(15,2)(10,3)(6,5)
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
30,115,210,36,5
Sixteen factor pairs.
20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
(30,1)(15,2)(10,3)(6,5)
24
(15,2)(10,3)
12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).
The positive integer factor pairs of 30 are (1, 30) , (2, 15), (3, 10), and (5, 6).
1&30 2&15 3&10 5&6
The factor pairs of 150 are 1*150, 2*75, 3*50, 5*30, 6*25, and 10*15
76 has 3 factor pairs: (1,76), (2,38), (4,19).
One pair: it's a prime number.