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Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
In a certain sequence, t_1 = -2
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09 Mar 2022, 04:00
09 Mar 2022, 04:00
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Question Stats:
12% (00:32) correct
88% (01:36) wrong based on 25 sessions
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In a certain sequence, \(t_1 = -2\), \(t_2 = -1\), \(t_3 = -3\), \(t_4 = -4\), \(t_5 = -7\), \(t_6 = -11\), and \(t_7 = -18\)
A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
Quantity A |
Quantity B |
\(t_8 \) |
-29 |
A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
In a certain sequence, t_1 = -2
[#permalink]
14 Mar 2022, 06:35
14 Mar 2022, 06:35
2
GreenlightTestPrep wrote:
In a certain sequence, \(t_1 = -2\), \(t_2 = -1\), \(t_3 = -3\), \(t_4 = -4\), \(t_5 = -7\), \(t_6 = -11\), and \(t_7 = -18\)
Quantity A |
Quantity B |
\(t_8 \) |
-29 |
5 days and no takers?
Okay, here's my solution:
Key concept: The GRE will never give you some values of a sequence and expect you to determine the general pattern of that sequence (regardless of how obvious that pattern made seem).
So, even if you recognize that -2, -1, -3, -4, -7, -11, -18... appears to be a version of a Fibonacci sequence (where each term in the sequence is the sum of the two values before it), we can't be 100% certain that it actually is that kind of sequence.
The -2, -1, -3, -4, -7, -11, -18... could also be a list of the low temperatures in Town X for the first 7 days in January, and \(t_8\) could be -5 (the temperature on day 8)
So, since the given sequence for this question is not defined, there's no way to determine the value of \(t_8\), which means there is no way to determine which quantity is greater.
Answer: D
NOTE: If you see GRE practice questions that give you an undefined sequence and require you to determine one of the terms of that sequence, then you're dealing with a bad resource, in which case I suggest you find a different resource.
gmatclubot
In a certain sequence, t_1 = -2 [#permalink]
14 Mar 2022, 06:35
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