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How many different ways can you connect seven noncollinear points?
Wiki User
∙ 14y ago
This is sort of like a probability problem:
Since you have 7 points, you can do
7 x 5 x 4 x 3 x 2 x 1 = 840 ways
The reason why it is 7x5x4x3x2x1 is because
At first you have 7 points to choose from, so that's why you have 7,
Then, you are left with 5 points to choose, it is not 6 because you need 2 points to make a line from the first part.
Then, after you got 2 lines, you are left with 4 points, it's not 3 because for here, you are using the previous point and the new point.
Wiki User
∙ 14y ago
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OK. Got it. What's next ?
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