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Anonymous
Note that 20 exactly divides 40 because 40 / 20 = 2. Then, the GCD of 20 and 40 is 20.
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GCD: 20
GCD(40, 4900) = 20 LCM(40, 4900) = 9800
GCD(12, 40) = 4
GCD stands for Greatest Common Divisor.