Mathematics · Permutations and Combinations
Consider a rectangle ABCD having 5, 6, 7, and 9 points in the interior of the line segments AB, BC, CD, and DA respectively. Let α be the number of triangles having these points from different sides as vertices and β be the number of quadrilaterals having these points from different sides as vertices. Then (β - α) is equal to:
- 1717✓
- 21890
- 31173
- 4795
Correct answer
717
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