collinear
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How many straight lines can be formed by 8 points of which 3 are collinear?
The formula is nC2 - rC2 + 1 In this problem: n = 8 and r = 3 8C2 = 28 3C2 = 3 Evaluating, we have: 28 - 3 + 1 26- math_celebrity
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- collinear combinations factorial
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