There are 70 points in a plane, no three of which are in the same straight line with the exception of 20 points, which are all in same straight line; find the number of triangles joining these straight lines.
Ans to follow, if possible give a general formula or little detail
Permo Combo continues 9
This topic has expert replies
-
- Legendary Member
- Posts: 1578
- Joined: Sun Dec 28, 2008 1:49 am
- Thanked: 82 times
- Followed by:9 members
- GMAT Score:720
Far far away, I have particularly tweaked this question with artificial numbers as many are just posting some ans and no logic...anyway your ans is far far away....real2008 wrote:i believe it to be 70C3-20C3
Charged up again to beat the beast
then post your logic.......maihuna wrote:Far far away, I have particularly tweaked this question with artificial numbers as many are just posting some ans and no logic...anyway your ans is far far away....real2008 wrote:i believe it to be 70C3-20C3
-
- Master | Next Rank: 500 Posts
- Posts: 338
- Joined: Fri Apr 17, 2009 1:49 am
- Thanked: 9 times
- Followed by:3 members
-
- Master | Next Rank: 500 Posts
- Posts: 399
- Joined: Wed Apr 15, 2009 3:48 am
- Location: india
- Thanked: 39 times
-
- Master | Next Rank: 500 Posts
- Posts: 231
- Joined: Thu Apr 12, 2007 2:45 am
- Thanked: 5 times
- Followed by:1 members
"find the number of triangles joining these straight lines"????
what do u mean by this?..which straight lines?...
U r question itself is ambiguous.
from the way I deciphered the answer is 34000
what do u mean by this?..which straight lines?...
U r question itself is ambiguous.
from the way I deciphered the answer is 34000
-
- Legendary Member
- Posts: 1035
- Joined: Wed Aug 27, 2008 10:56 pm
- Thanked: 104 times
- Followed by:1 members