- #1
Physicsissuef
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- 0
Homework Statement
5 dots in some plane can create how many lines?
a)5
b)10
c)15
d)20
Homework Equations
The Attempt at a Solution
If you ask me, I will say infinite, but the creators of the question think that one line can be created from at least 2 dots. Line can be created from 3, 4 ... n dots.
2 dots can create [tex]C_5^2[/tex] lines, and it is 10 lines. But what about those with 3 dots?