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Updated on: 20 Jun 2013, 04:56
Originally posted by hardnstrong on 09 Jun 2010, 11:18.
Last edited by Bunuel on 20 Jun 2013, 04:56, edited 1 time in total.
Last edited by Bunuel on 20 Jun 2013, 04:56, edited 1 time in total.
OA added.
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
55% (00:38) correct
45%
(00:38)
wrong
based on 182
sessions
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Is the triangle with three sides a, b, c, isosceles?
(1) a = b
(2) c ≠ b
OA will be posted later
(1) a = b
(2) c ≠ b
OA will be posted later
09 Jun 2010, 11:28
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IMO C
A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.
A and B together - SUFFICIENT.
A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.
A and B together - SUFFICIENT.
09 Jun 2010, 12:07
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hardnstrong
sjayasa
This cannot be the real GMAT question as it test technicality of defining isosceles triangle:
If we say that an isosceles triangle is a triangle with exactly two equal sides then the answer is C.
If we say that an isosceles triangle is a triangle with at least two equal sides then answer is A. So if we take this definition (which is more precise and more common) then we'll have that equilateral triangle is just a special case of isosceles triangle.
If I had to pick I'd pick A for this question.
