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01 Mar 2019, 07:44
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D
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:
21% (01:50) correct
79%
(02:13)
wrong
based on 81
sessions
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Not Attempted Yet
GMATH practice exercise (Quant Class 18)
From the figure shown, each of N people will be asked to take 7 points out, so that the 3 points left form vertices of an equilateral triangle. If all of them proceed correctly, what is the minimum value of N to guarantee that at least two people will take out exactly the same 7 points?
(A) 13
(B) 14
(C) 15
(D) 16
(E) 17
From the figure shown, each of N people will be asked to take 7 points out, so that the 3 points left form vertices of an equilateral triangle. If all of them proceed correctly, what is the minimum value of N to guarantee that at least two people will take out exactly the same 7 points?
(A) 13
(B) 14
(C) 15
(D) 16
(E) 17
01 Mar 2019, 11:22
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fskilnik
\(?\,\, = \,\,\left( {\# \,\,{\rm{possible}}\,\,\Delta \,\,{\rm{equilateral}}\,\,{\rm{configurations}}} \right)\,\,{\rm{ + }}\,\,{\rm{1}}\)
\(? = 15 + 1 = 16\)
The correct answer is (D).
We follow the notations and rationale taught in the GMATH method.
Regards,
Fabio.
OhsostudiousMJ
Joined: 28 Jan 2019
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GMAT 1: 700 Q49 V36
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02 Mar 2019, 09:47
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fskilnik
Hi, please explain why 1 is added?
