Six dots are evenly spaced on the circumference of a circle. How many combinations of three dots can we make from these 6 dots that do not form an equilateral triangle?	Choose the correct option
A) 18 B) 17 C) 16 D) 15 E) 14
The total number of ways we can choose three dots is 6C3=20.   We can form two equilateral triangles from these six dots.   There are  20 - 2= 
<gadget id="calculator"> 20 - 2</gadget>
<output>18</output>
18 combinations which do not form an equilateral triangle.   The answer is 18.
<result>A</result>
Six dots are evenly spaced on the circumference of a circle. How many combinations of three dots can we make from these 6 dots that do not form an equilateral triangle?