There's going to be six different possibilities for this slot right there. Let's put a six right there. Now, they told us that the colors cannot be repeated. Whatever color is in this slot, we're going to take it out of the possible colors. Now that we've taken that color out, how many possibilities are when we go to this slot, when we go to the next slot? How many possibilities when we go to the next slot right here? We took one of the six out for the first slot, so there's only five possibilities here.