One possible answer is: Un = 4n2 - 36n + 89 for n = 1, 2, 3.
33/57 = 11/19
33
65
The LCM is 627.
Because 57 is bigger then 33
The greatest common factor of 57 and 33 is 3. 57/3 = 19 and 33/3 = 11
It is a rational number because it can be expressed as a fraction in the form of 19/33 = 0.'57' repeating '57'
I'd multiply them together because 17 is a prime number and 57 isn't a multiple of 17 so the LCM has to be their product.
LCM(21, 33, 57) = 4389.
43 (the other 3 are divisible by 3)
It is: 57*17 = 969