1, 3, 5, 15
1, 2, 3, 6, 9, 18
1, 3, 7, 21
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The factors of 18 are: 1, 2, 3, 6, 9, and 18.The prime factors of 18 are: 2 and 3.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
Factors or 18: 1, 2, 3, 6, 9, 18 Factors of 21: 1, 3, 7, 21 They both have a factor of 3
The factors of 21 are 1, 3, 7 and 21. The factors of 18 are 1, 2, 3, 6, 14 and 18. Therefore the common factors are 1 and 3.
The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 21 are: 1, 3, 7, 21
The factors of 15 are: 1, 3, 5, 15 The factors of 18 are: 1, 2, 3, 6, 9, 18
The factors of 21 are 1, 3, 7, 21. The factors of 63 are 1, 3, 7, 9, 21, 63
The factors of 15 are 1, 3, 5, and 15. The factors of 18 are 1, 2, 3, 6, 9, and 18. The common factors of 15 and 18 are 1 and 3.
The factors of 15 are: 1, 3, 5, 15 The factors of 21 are: 1, 3, 7, 21 The factors of 33 are: 1, 3, 11, 33
The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 21 are: 1, 3, 7, 21 The factors of 27 are: 1, 3, 9, 27
18 has prime factors 3 & 2 whereas 21 has prime factors 3 & 7.
It is: 21+18+15 = 54 and 54/3 = 18 which is the mean average