BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

pls ans

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 23
Joined: Sun May 24, 2009 7:27 am
Location: Glasgow

pls ans

by Inspired » Tue Jan 19, 2010 1:23 am
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
Top
Source: — Problem Solving |
Junior | Next Rank: 30 Posts
Posts: 23
Joined: Sun May 24, 2009 7:27 am
Location: Glasgow

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
Top
User avatar
Legendary Member
Posts: 1275
Joined: Thu Sep 21, 2006 11:13 pm
Location: Arabian Sea
Thanked: 125 times
Followed by:2 members

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
Always borrow money from a pessimist, he doesn't expect to be paid back.
Top
Post new topic Post Reply
• Page 1 of 1