Fix the Pattern

Something is wrong — can you spot it?

 
Uh oh! One of these patterns has a mistake. Can you find what is wrong?
🔴 🔵 🔴 🔴 🔵
The 4th one should be 🔵 blue, not 🔴 red!
The pattern should be red, blue, red, blue, red… but one is wrong. To fix a pattern, work out the rule and check each one follows it.