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# ABCDE is a regular pentagon with F at its center. How many

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Manager
Joined: 09 May 2006
Posts: 98

Kudos [?]: 45 [0], given: 0

Location: Bangalore, India
ABCDE is a regular pentagon with F at its center. How many [#permalink]

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11 Jun 2006, 01:24
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ABCDE is a regular pentagon with F at its center. How many different triangles can be formed by joining 3 of the points A, B, C, D, E and F?
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Kudos [?]: 45 [0], given: 0

Manager
Joined: 09 May 2006
Posts: 98

Kudos [?]: 45 [0], given: 0

Location: Bangalore, India

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11 Jun 2006, 05:29
surajch wrote:
6C3 or 6! / (3! x 3!) = 20 triangles

20 is correct. I messed up by not using the P&C approach

Kudos [?]: 45 [0], given: 0

11 Jun 2006, 05:29
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