You have 10 pink balls and 15 purple balls. How many distinguishable arrangements are possible if two pink balls cannot be next to each other?(adsbygoogle = window.adsbygoogle || []).push({});

I know the answer is 8008 but I have no idea how to get this

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Quick counting question

**Physics Forums | Science Articles, Homework Help, Discussion**