A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 3 and 4
Correct Answer: C
Solution :
Factors of \[12=1,\text{ }2,\text{ }3.\text{ }4,\text{ }6,\text{ }12\] Factors of \[15=1,\text{ }3,\text{ }5,\text{ }15\] Common factors of 12 and 15=1 and 3.
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