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In the image, lines l and m are parallel. Of the 16 angles s

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Director
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In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 23 Jun 2013, 01:47
1
4
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

8% (00:44) correct 92% (00:59) wrong based on 110 sessions

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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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Re: In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 23 Jun 2013, 17:00
1
IMO, answer should be B (2 angles).
Here is my 2 cents
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Re: In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 24 Jun 2013, 02:33
I picked 2 as well lol but the OA is 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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Re: In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 25 Jun 2013, 16:26
2
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  [#permalink]

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New post 18 Jul 2014, 02:07
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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Re: In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 18 Jul 2014, 02:55
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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Re: In the image, lines l and m are parallel. Of the 16 angles s  [#permalink]

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New post 27 Aug 2018, 16:11
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Re: In the image, lines l and m are parallel. Of the 16 angles s &nbs [#permalink] 27 Aug 2018, 16:11
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