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22 Jul 2008, 18:53
Kudos
Bookmarks
Line M and N are parallel to each other and there are 5 points on line M are 4 points on line N. By connecting the points on the lines, how many triangles can be formed?
(A) 30
(B) 40
(C) 60
(D) 70
(E) 100
(A) 30
(B) 40
(C) 60
(D) 70
(E) 100
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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22 Jul 2008, 21:01
Kudos
Bookmarks
Take one point from one line and other two points from the other line.
5*4C2 + 4*5C2 = 5*4*3/2 + 4*5*4/2
= 30 + 40
=70
Ans D.
5*4C2 + 4*5C2 = 5*4*3/2 + 4*5*4/2
= 30 + 40
=70
Ans D.
22 Jul 2008, 21:53
Kudos
Bookmarks
Awesome answer! Kudos, +1!
This question has similar application for questions such as:
There are 5 Girls and 4 boys in a class. In how many ways can a group of 3 be formed and have exactly 2 of the same gender in the group?
OR
There are 5 red marbles and 4 blue marbles in a bag. In how many ways can you draw 3 marbles out and have exactly 2 marbles of the same color? A twist on this would be probabilty:
When selecting 3 marbels, without replacing, what is the probability that exactly 2 will be the same color?
This question has similar application for questions such as:
There are 5 Girls and 4 boys in a class. In how many ways can a group of 3 be formed and have exactly 2 of the same gender in the group?
OR
There are 5 red marbles and 4 blue marbles in a bag. In how many ways can you draw 3 marbles out and have exactly 2 marbles of the same color? A twist on this would be probabilty:
When selecting 3 marbels, without replacing, what is the probability that exactly 2 will be the same color?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
