Find an integer N. (1) ^ =4 (2) N^4=16 This is from old

Question

Find an integer N.

(1)  ^ =4
(2) N^4=16 

This is from old thread with answer E . 
I get A.

eschn3am · Answer

2 and -2 work for both of those equations

since we can't narrow it down to just one value for N it's insufficient

kumarajeet06 · Answer

I would go with E as 2 and -2 satisfy both conditions.

eschn3am · Answer

it says |n|^|n|=4

those brackets are absolute value signs. Whether you put 2 or -2 in there the answer will come out as 2^2=4

two answers are possible so it's insufficient.

and for the 2nd statement, remember that raising any number to an even power is dangerous because the sign will always come out positive, regardless of the sign going in. so once again 2^4 = (-2)^4 = 16

eschn3am · Answer

for B to be sufficient it needs to narrow down the possible choices to ONE right answer.

2*2*2*2 = 16
(-2)*(-2)*(-2)*(-2) = 16

how can B be sufficient? N could be 2 or -2. If there are two possible answers it isn't sufficient at all.

Find an integer N. (1) ^ =4 (2) N^4=16 This is from old

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