If GCD(a,b)=1\text{GCD}(a, b) = 1GCD(a,b)=1, which of the following is guaranteed to be true?
aaa and bbb are both prime numbers
a⋅b=LCM(a,b)a \cdot b = \text{LCM}(a, b)a⋅b=LCM(a,b)
a+ba+ba+b must be an odd number
aaa and bbb must be odd