If friction did not exist, it would be hard for us to slow down in running, or putting breaks on a car, and more!
If friction did not exist, your car will slide down the road even if you try your best to put the brakes on a car. Friction is a very important force to slow down things that are moving very fast
Hoped this helped.
Im pretty sure it is cause multiply 2/3 times 2 is 4/6
The 11- 6 is between the pair