The least common multiple of two positive integers is 12 and their product is 12. What is their greatest common divisor ?

(A) 1
(B) 2
(C) 3
(D) 6
(E) 18
(SAT Subject Test Question)
Thanks in advance 🙂

Number pairs with LCM of 12: (12, 1), (4, 3)

In each case, their product is also 12, and in each case, their greatest common divisor is 1.

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