2: 2
3: 3
4: 2
5: 5
6: 2, 3
7: 7
8: 2
9: 3
10: 2, 5
11: 11
12: 2, 3
13: 13
14: 2, 7
15: 3, 5
16: 2
17: 17
18: 2, 3
19: 19
20: 2, 5
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Prime factors are for a specific number. The prime factors of 20 are 2, 2, and 5. The prime factor of 19 is 19. The prime factors of 18 are 2, 3, and 3.
The prime factors of 10 and 20 are 2 and 5.
The prime numbers between 10 and 20 are 11, 13, 17 and 19.
Just use the definition of "mean". That is:
a) Add them all up
b) Count how many there are
c) Divide the answer of part (a) by the answer of part (b).
60 ÷ 4 = 15
The prime factors are: 2 x 2 x 5
It's not, because all the factors of 20 aren't prime.
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.
The factors of 4 are 1, 2, and 4. The only prime factor of 4 is 2. The factors of 20 are 1, 2, 4, 5, 10, and 20. The prime factors of 20 are 2x2x5.
There are no common factors between these values since 11 is prime and 20 is composite. Then, there are no common prime factors between these values.