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# 8 points lie on the circumference of a circle. What is the

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CEO
Joined: 15 Aug 2003
Posts: 3339
8 points lie on the circumference of a circle. What is the  [#permalink]

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20 Sep 2003, 12:52
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8 points lie on the circumference of a circle. What is the positive difference between the number of triangles and the number of quadrilaterals that can be formed by connecting these points.

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Intern
Joined: 21 Jul 2003
Posts: 38
Location: India

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21 Sep 2003, 03:41
1
No. of triangles = 8C3 = 56
No. of Quadrilaterals = 8C4 = 70
Hence the diff= 14
SVP
Joined: 30 Oct 2003
Posts: 1681
Location: NewJersey USA

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16 Jan 2004, 22:29
8C4+7C4+6C4+5C4+4C4 = 126

No of Triangles =
8C3+7C3+6C3+5C3+4C3+3C3 = 1190

Difference = 1064
Manager
Joined: 26 Dec 2003
Posts: 218
Location: India

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17 Jan 2004, 04:58
is it 14, 8C4-8C3= 70-56=14 BUT is the question like the difference between quadrilaterals and triangles or the other way round

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Joined: 09 Sep 2013
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Re: 8 points lie on the circumference of a circle. What is the  [#permalink]

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17 Mar 2019, 22:58
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Re: 8 points lie on the circumference of a circle. What is the   [#permalink] 17 Mar 2019, 22:58
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