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# In a single row of yellow, green and red colored tiles

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Intern
Joined: 13 Jun 2017
Posts: 15
Re: In a single row of yellow, green and red colored tiles  [#permalink]

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24 Aug 2017, 11:15
This doesn't test your quantitative ability. It tests your level of distrust.
Intern
Joined: 24 Oct 2014
Posts: 16
Location: Spain
Schools: LBS '21 (II)
In a single row of yellow, green and red colored tiles  [#permalink]

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Updated on: 08 Jan 2018, 05:58
I believe this question to be wrong:

What colour is the 1st Tile?
- Every red tile is preceded immediately by a yellow tile -> The 1st tile can't be red
- Every yellow tile is preceded immediately by a green tile -> The 1st tile can't be yellow

So the first tile is GREEN, and we know the sequence is Green, Yellow, Red, ... Then 24th must be red. We don't even need info from (1) nor (2).

Originally posted by Fernandocma on 06 Jan 2018, 10:29.
Last edited by Fernandocma on 08 Jan 2018, 05:58, edited 1 time in total.
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In a single row of yellow, green and red colored tiles  [#permalink]

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06 Jan 2018, 12:11
Fernandocma wrote:
THIS QUESTION IS WRONG:

What colour is the 1st Tile?
- Every red tile is preceded immediately by a yellow tile -> The 1st tile can't be red
- Every yellow tile is preceded immediately by a green tile -> The 1st tile can't be yellow

So the first tile is GREEN, and we know the sequence is Green, Yellow, Red, ... Then 24th must be red. We don't even need info from (1) nor (2).

Hi Fernandocma
What about a case where you have GYRGGGGGGGGGGGGGGGGGGGGG.
the question does not provide any restriction for Green tile.
Intern
Joined: 24 Oct 2014
Posts: 16
Location: Spain
Schools: LBS '21 (II)
Re: In a single row of yellow, green and red colored tiles  [#permalink]

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08 Jan 2018, 05:59
You are right and I stand corrected. Thank you very much.
Intern
Joined: 06 Jun 2018
Posts: 3
GMAT 1: 620 Q48 V27
Re: In a single row of yellow, green and red colored tiles  [#permalink]

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12 Jun 2018, 00:44
The question stem says every Red tile is preceded immediately by a yellow tile. If that is the case , 21st tile has to be Green and the tiles will follow GYR GYR GYR.... pattern. If it were Red, it would have defeated the purpose of the word "every".
IMO, the answer should be C.
Re: In a single row of yellow, green and red colored tiles &nbs [#permalink] 12 Jun 2018, 00:44

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