X xxpinkribbonz Guest Apr 6, 2009 #1 6. In the kingdom of Up, royal license plates have 4 letters. Each letter is either a U or a P, but there can never be two P's next to each other. How many different license plates are possible?
6. In the kingdom of Up, royal license plates have 4 letters. Each letter is either a U or a P, but there can never be two P's next to each other. How many different license plates are possible?
D Dagon Guest Apr 6, 2009 #2 uuup uupu upuu upup puuu pupu puup Seven. With this kinds of problems, it easier if you try and write down the different possibilities.
uuup uupu upuu upup puuu pupu puup Seven. With this kinds of problems, it easier if you try and write down the different possibilities.
? --- Guest Apr 6, 2009 #3 7 1 combo of 4u 4 combos of 3u 1p 2 combos of 2u 2p 0 combos of 1u 3p or 4p
