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805+ (Hard)|   Geometry|      
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In the image, lines l and m are parallel. Of the 16 angles s 23 Jun 2013, 01:47
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

95% (hard)

Question Stats:

7% (01:31) correct 93% (01:09) wrong based on 136 sessions

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angles.gif [ 3.48 KiB | Viewed 4890 times ]
In the image, lines l and m are parallel. Of the 16 angles shown, what is the minimum number angles that would need to be provided in order to guarantee that all 16 angles could be determined from the information provided?

A 1
B 2
C 4
D 6
E 9
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E
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pqhai
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In the image, lines l and m are parallel. Of the 16 angles s 23 Jun 2013, 17:00
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IMO, answer should be B (2 angles).
Here is my 2 cents
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In the image, lines l and m are parallel. Of the 16 angles s 24 Jun 2013, 02:33
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I picked 2 as well lol but the OA is
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9
so was wondering what others thought...

The OA emphasized on what is the minimum number angles that would need to be provided in order to guarantee
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BBEKKS
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In the image, lines l and m are parallel. Of the 16 angles s 25 Jun 2013, 16:26
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The reason the answer is E is because theoretically you could know all 8 angles of line n, and still know none of the angles of line o. Therefore to guarantee that we know all 16 angles we must have at least one angle on each transversal, the minimum, therefore, is 9.
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In the image, lines l and m are parallel. Of the 16 angles s 18 Jul 2014, 02:07
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Damn. I was too focused on the Geometry part that I completely overlooked that it was also a Min-Max question.

Need more attention to detail.
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SVaidyaraman
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In the image, lines l and m are parallel. Of the 16 angles s 18 Jul 2014, 02:55
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I am not convinced with the OA. If the question were, "What is the number of angles that would need to be provided in order to guarantee that all 16 angles could be determined from the information provided?" then the answer would be 9. But when you ask for the minimum number of angles, it has to be 2.
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In the image, lines l and m are parallel. Of the 16 angles s 07 Jan 2024, 19:25
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Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

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