How to assign values Dynamically to Range Statement

Usally if we want to select the data from A10 cell to D13 cell we will write the statement as

                Range("A10:D13").select

here i want to assign the values(10,13) dynamically.means using some variables i and j.

              Range("A13:D" & i)--this is the statement to assign only one value.

I want to assign 2 values using some other variables.

Can anyone help me please.....