2 x 5 = 10
3 x 5 = 15
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15. 150 = 10 x 15, 165 = 11 x 15 and 10 and 11 are co-prime
The prime factorization of 77 = 7 x 11The prime factorization of 15 = 3 x 5
The GCF of 15, 25, and 30 is 5.The prime factorization of 15 is 3*5.The prime factorization of 25 is 5*5The prime factorization of 30 is 2*3*5So the GCF of 15, 25, and 30 is 5.
1 is the greatest and only common factor of 15 and 38. The prime factorization of 15 is 3*5. The prime factorization of 38 is 2*19
10 = 2 × 5