Note that 17 is a Prime number so its only factors are itself and 1.
This tells us that the LCD, which is the least common multiple of the denominators is
12x17 which is 204.
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The LCD is 1. The GCD is 17.
LCD(12, 20) = 60
LCD(12, 9) = 36
LCD = 119 (7x17=119)
Since 11 and 17 are both prime, you multiply them together to get the LCD which comes out to be 187.