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![[Post New]](/templates/default/images/icon_minipost_new.gif) posted on 21 May 2007 10:04:33 IST
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Geometrical permutations - If n pts. are given, then no. of straight lines(if no 3 pts. are collinear) is nC2.
- If out of n pts., m are collinear, then no. of straight lines is nC2 - mC2 +1.
- No. of triangles formed from n pts.(no 3 pts. are collinear) nC3.
- No. of triangles formed from n pts., when m are collinear is nC3 ? mC3.
- If a polygon has n sides, then no. of diagonals is [n(n-3)]/2.
- No. of Parallelogram in 2 systems of parallel lines(m parallel lines in first, n parallel lines in second) is nC2 * mC2.
Jai Hind. original.
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this article: 22 points
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(posted on 21 May 2007 10:07:32 IST)
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| plz comment |
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(posted on 21 May 2007 10:29:09 IST)
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| hey i know these formulas already..!!!!! y dont u add no of squares and rectangles in chess board..!! |
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(posted on 21 May 2007 10:58:43 IST)
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| Superbbbb...... |
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(posted on 21 May 2007 10:59:20 IST)
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| hey,dinesh, if u did know these formulas, there is no need to express it...... |
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(posted on 21 May 2007 11:02:03 IST)
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| good man............. |
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(posted on 21 May 2007 11:05:38 IST)
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| thanks ji |
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(posted on 21 May 2007 11:53:29 IST)
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| realy great |
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(posted on 21 May 2007 12:11:50 IST)
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| tooo gud macha..... |
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