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How many triangles can be formed by joining 12 points, 7 of

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How many triangles can be formed by joining 12 points, 7 of [#permalink] New post 09 Sep 2004, 11:47
How many triangles can be formed by joining 12 points, 7 of which as collinear?
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 [#permalink] New post 09 Sep 2004, 12:59
3 points needed to form a triange. Total possibilities is 12C3.
However, 7 points are in the same line (collinear), hence we can't have a traingle. The net result is,

(12C3 - 7C3).
  [#permalink] 09 Sep 2004, 12:59
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