Source: Official Guide for GMAT Review 2016 Data Sufficiency ; #20
AMURE ADENIYI BOLAJI COLLINS
(1) since w^ (-1) = 2^(-1), then w^(-2) = w^(-1)(2) = 2^(-1)(2) = 4^(-1)
(2) i don't know how to interprete this. pls. explain this to me...tx
Nov 5, 2016 • Comment
Sam Kinsman
Hi Amure,
You're right that from statement 1, we can conclude that w^(?2) is 1/4 (or 4^(-1)).
Statement 2 says that w^3 = 8. Since 2^3 = 2*2*2 = 8, we know that w must be equal to 2. So w = 2, and therefore w^(?2) = 2^(-2) = 1/4.
Both statements by themselves are sufficient, and the answer is D
Nov 11, 2016 • Reply
Nicholas Dureault
This question has a mistake in it - be warned.
The prompt is: What is the value of W^(-2)
1) w^(-1) = 1/2 2) w^(8) = 8
for 2, what they meant to say (and is in the answer key) is: 2) 2^(3) = 8
Jan 14, 2016 • Comment
Cydney Seigerman, Magoosh Tutor
Thanks for your message! I've let the content editors know so that this can be corrected. Since we're a small team, it may some time to change that. However, in the meantime, your comment will help other students who visit the forum! Thanks again :)
Jan 15, 2016 • Reply
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