Solution

196124

Problem / game
Button-Up Some More Back to problem
First name
Gemma and Zali
School
Allhallows
Country
Australia
Age
0

You can calculate the number of ways by using the binary concept (each button has 2 possibilities: fastened or unfastened). So, the number of ways would be 2^4, which equals 16. Therefore, there are 16 ways to button up four buttons.