Problem 3:
My answer is 6C3+(6)(7)(7)+7C3+7C3=384.
Search found 62 matches
- Wed Sep 30, 2015 12:21 pm
- Forum: Combinatorics
- Topic: Combinatorics problems
- Replies: 7
- Views: 5708
- Tue Sep 29, 2015 9:17 pm
- Forum: Higher Secondary Level
- Topic: permutation
- Replies: 5
- Views: 5172
Re: permutation
Based on the same situation, how many triangles can be formed?
- Mon Sep 28, 2015 9:26 pm
- Forum: Combinatorics
- Topic: Combinatorics problems
- Replies: 7
- Views: 5708
Re: Combinatorics problems
I have solved them but I am uncertain about the solutions. Can you post the solutions?
- Wed Sep 23, 2015 12:13 pm
- Forum: Combinatorics
- Topic: Combinatorics problems
- Replies: 7
- Views: 5708
Combinatorics problems
Q1. A plane has 15 points, 5 of them are collinear. Other than this, if no 3 points are collinear, find the total number of triangles and straight lines that can be formed. Q2. A country has N cities and N roads. Between any two cities, there is maximum one road. Prove that there is at least one cit...
- Sat Jan 31, 2015 9:16 pm
- Forum: Secondary: Solved
- Topic: Divisional MO Secondary 2011
- Replies: 3
- Views: 10766
Re: Divisional MO Secondary 2011
Answer to prob.no.9 is 60.
- Sat Jan 17, 2015 4:30 pm
- Forum: Secondary: Solved
- Topic: Divisional MO Secondary 2011
- Replies: 3
- Views: 10766
Re: Divisional MO Secondary 2011
Answer to prob.no.3 is 32.
- Sat Jan 17, 2015 4:26 pm
- Forum: Secondary: Solved
- Topic: Divisional MO Secondary 2010
- Replies: 2
- Views: 9346
Re: Divisional MO Secondary 2010
Answer to ques. no.4 is 22.
- Sat Jan 17, 2015 4:07 pm
- Forum: Divisional Math Olympiad
- Topic: Barisal Secondary 2013 / 9
- Replies: 1
- Views: 2615
Re: Barisal Secondary 2013 / 9
Show the solution Labib bhai.
- Fri Jan 09, 2015 6:23 pm
- Forum: Divisional Math Olympiad
- Topic: Chittagong 2013 higher secondary problem 9
- Replies: 5
- Views: 5494
Re: Chittagong 2013 higher secondary problem 9
Or maybe 1/38^2.
- Fri Jan 09, 2015 6:20 pm
- Forum: Divisional Math Olympiad
- Topic: Chittagong 2013 higher secondary problem 9
- Replies: 5
- Views: 5494
Re: Chittagong 2013 higher secondary problem 9
I think the answer is 1/81.