(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

5 dots in some plane can create how many lines?

a)5

b)10

c)15

d)20

2. Relevant equations

3. 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?

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# Dots, line

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