How many different product codes do not contain U?

Question

Assume that product codes are formed from the letters X, Y, S, W, R, and U, and consist of 5 not necessarily distinct letters arranged one after the other. For example, XXRRY is a product code.

Answer 1

Since only 5 of the letters are being used, you multiply 5×5×5×5×5=3125 labels can be made.

Answer 2

If U is not allowed, then there would be only 5 letters to choose from for each of the 5 positions. So the different product codes in this case are 5x5x5x5x5 = 5^5 = 3125.