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11 Oct 2019, 02:01
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
67% (01:03) correct
33%
(00:59)
wrong
based on 175
sessions
History
Date
Time
Result
Not Attempted Yet
siddharthkapoor
GMAT Club Reviews PM Intern
Joined: 10 Apr 2018
Last visit: 09 Jun 2025
Posts: 529
Own Kudos:
Given Kudos: 522
Location: India
Schools: ISB'22 (D)
GMAT 1: 680 Q48 V34
GPA: 3.3
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11 Oct 2019, 08:30
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(1) Since we don't know what the function is we can't comment whether or not f(n)>f(n-1)
Thus, insufficient.
(2) f(n)= n-1
So, f(n-1)= (n-1)-1=n-2
=> f(n)>f(n-1)
Thus, sufficient.
Therefore, the answer is option B.
Thus, insufficient.
(2) f(n)= n-1
So, f(n-1)= (n-1)-1=n-2
=> f(n)>f(n-1)
Thus, sufficient.
Therefore, the answer is option B.
11 Oct 2019, 09:32
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Bunuel
Is f(n) > f(n−1)?
(1) n = 8
(2) f(n) = n−1
(1) n = 8
(2) f(n) = n−1
Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
Visit https://www.mathrevolution.com/gmat/lesson for details.
The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question. We should simplify conditions if necessary.
Since f(n)=n-1 from condition 2), we have f(n)-f(n-1) = (n-1)-((n-1)-1)=n-1-n+2 = 1 > 0 or f(n)>f(n-1).
Condition 2) is sufficient since it yields a unique solution.
Condition 1)
Since we don't know f(7) and f(8) and it doesn't give any information about f(8) and f(7), it is not sufficient.
Therefore, B is the answer.
