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pls ans

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Source: — Problem Solving |
Junior | Next Rank: 30 Posts
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by Inspired » Tue Jan 19, 2010 1:26 am
Inspired wrote: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?
10
15
20
25

pls ans with explanation

sorry, got the ans, such a simple Q.didnt read properly before
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by ajith » Tue Jan 19, 2010 3:20 am
Inspired wrote: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?
10
15
20
25

pls ans with explanation
Since it is a regular pentagon no three of these point A B C D E or F will fall in a straight line. Hence the problem becomes selection of three points from 6 available to make a triangle. that 6c3 =20. I can explain if it is confusing
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