• anonymous
Four points A, B, C, and D are coplanar, but only two at a time are collinear. Suppose a line is drawn through each pair of points. How many lines can you draw? a)0 b)2 c)4 d)6
  • Stacey Warren - Expert
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  • katieb
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  • anonymous
Draw it on a piece of paper. It's easy enough to just add them up. There IS a very simple pattern and formula that you can figure out quickly. Just start with 1 point. Mark how many lines you can make. Then your 2nd point. Mark how many lines you can make with that. Do it a couple more times and you should see the pattern.

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