Challenge 3, no. 8 - DS question : DS Archive
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Challenge 3, no. 8 - DS question

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Manager
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Challenge 3, no. 8 - DS question [#permalink]

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New post 22 Nov 2006, 16:10
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Challenge 3, no. 8

Can't understand solution to this problem - help please?

ab, bc, ac represent sides of a triangle ABC. is the triangle an equilateral triangle?
1. ab=1
2. bc+ac=2

Answer: e - both insufficient.

It is obvious that either of the statements is not enough by itself to answer the question.
Take the two sets together
Possible triangles with sides:
1/1/1 - equilateral
1/0.9/1.1 is not equilateral
1/0.8/1.2 is not equilateral
1/0.7/1.3 is not equilateral
1/0.6/1.4 is not equilateral
The answer is E
Director
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 [#permalink]

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New post 22 Nov 2006, 16:19
Quote:
Challenge 3, no. 8

Can't understand solution to this problem - help please?

ab, bc, ac represent sides of a triangle ABC. is the triangle an equilateral triangle?
1. ab=1
2. bc+ac=2

Answer: e - both insufficient.

It is obvious that either of the statements is not enough by itself to answer the question.
Take the two sets together
Possible triangles with sides:
1/1/1 - equilateral
1/0.9/1.1 is not equilateral
1/0.8/1.2 is not equilateral
1/0.7/1.3 is not equilateral
1/0.6/1.4 is not equilateral
The answer is E


You answered your own question. The fact that you've listed 5 possible outcomes when both statements are taken together illustrates that there is no definitive answer to this prob. You'd need more info than what's available - hence E
Manager
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Joined: 27 Sep 2006
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 [#permalink]

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New post 22 Nov 2006, 18:35
What are the 5 outcomes - I don't understand the notation.

triangle 1 is obviously - each side = 1
but the rest?

thanks!
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New post 22 Nov 2006, 19:14
consider this case:

all three sides are 1: equilateral.

and

three sides: ab = 1
bc = 0.7, ac = 1.3.
it is a triangle, but not equilateral.

so E.
  [#permalink] 22 Nov 2006, 19:14
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Challenge 3, no. 8 - DS question

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