If |2n+11|=15, what is the value of n?

Question

(1) n^3 n^5

Kurtosis · Answer

|2n + 11| = 15 --> n = 2 or -13

St1: n^3 < 0 --> n is negative --> n = -13. Sufficient

St2: n^4 > n^5 --> 2^4 is not greater than 2^5 --> n = -13. Sufficient

Answer: D

prathameshbhirud · Answer

|2n + 11| = 15 --> n = 2 or -13

St1: n^3 < 0 --> n has to be negative so n = -13. Sufficient

St2: n^4 > n^5 --> suggest either n is -ve ( if n= -2 then (-2)^4 > (-)^5) or n is +ve fraction (we can consider as no restriction specified) n = 1/2 then also n^4 > n^5, so cannot decide...Insufficient.....

So, I would go with A

Please correct me if I am wrong in logic.

Kurtosis · Answer

Hi,

The value of n is either 2 or -13. So you cannot take the value of n as -2.

2^4 is not greater than 2^5 (Violates St2 and hence cannot be considered)
 whereas
 (-13)^4 > (-13)^5 (Satisfies St2)
St2 is sufficient.

Himanshu9818 · Answer

solve |2n+11| =15 
n=2 and - 13

statement 1 tells you n^3<0 that means n is negative so n=-13 sufficient. 
statement 2 tells you n^4>n^5 that means n is negative so n=-13 sufficient.

answer D

pantanshum · Answer

Both the statements tell you that N is negative

Sent from my iPhone using Tapatalk

If |2n+11|=15, what is the value of n?

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards