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![[#24] 2 Min. Challenge : Lines](https://cdn.gmatclub.com/cdn/files/forum/styles/gmatclub_light/imageset/icon_post_target_unread.svg "[#24] 2 Min. Challenge : Lines"){kind=icon}
19 Mar 2004, 05:52
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1. Time yourself
2. Solve as fast as you can
3. Write your solution here and your time.
If 10 parallel lines intersect 9 parallel lines then what is the number of
paralellograms thus formed?
1. 45
2. 90
3. 19C4
4. 10c2 * 9c2
5. 10c4 * 9c4
2. Solve as fast as you can
3. Write your solution here and your time.
If 10 parallel lines intersect 9 parallel lines then what is the number of
paralellograms thus formed?
1. 45
2. 90
3. 19C4
4. 10c2 * 9c2
5. 10c4 * 9c4
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19 Mar 2004, 06:15
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D) Same 9C2*10C2 since out of 9 lines, you have to pick 2 to form a parallellogram. Same with the other 10 lines from which you have to pick 2. About 1 min
