I don't really understand what you mean by "factors"... factors of 2 and factors of 3?

If you have a 1.2M concentration, and you want to dilute it to .45M concentration, you are diluting it by a factor of 1.2/.45 or 2.666666.

To do that, add 1.66666 parts water, one part original solution.

ummm.... i have 1.0 M concentration of CuSO4, and I want to dilute it 0.5 M.

Then the factor is 2as in 1/.5 So for dilution to a factor of 2, one part water, one part original concentration