I am trying to understand the product rule and I have a simple example it says,
If I have a license plate with two English letters how many different plates can be made?
The answer is 26^2
Now another question is in the same format but it asks how many plates can be made with upper and lower case letters. Would this still be counted as 26^2? Or would this be 52^2? Or are they all different sets, making it 78^2? I looked through lecture slides and they were no help. Thanks again.