If gcd(a,b)=18\gcd(a, b) = 18gcd(a,b)=18, which statement MUST be true?
Both aaa and bbb are divisible by 18
Both aaa and bbb are even
a+b=18a + b = 18a+b=18
a=18a = 18a=18 or b=18b = 18b=18