Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: if the lcm of a and b is 72 and their hcf is 6 , what is the product of a & b ?
432
12 * 6 * 12 = 144.