Coins and Tangents
Probability
Level
3
Sixteen coins are thrown so that no two of them overlap nor touch, and no three of them have a tangent line in common. What is the total number of lines which are tangent to every pair of coin?
The answer is 480.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
16C3 - 13C2 -2 =480