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Did the Economist GMAT make an error?

Expert replies
by jbotero08 » Wed Jun 25, 2014 1:42 pm
I answered "C" to the following question since

a^b=1 could be that b is 0 and a is any number but with the added info that b is not zero there is the possibility of a^1=1 which would mean a=1. Does this logic make sense?

Here is the question:

a^b=c

If a, b and c are integers, what is the value of a?

(1) c=1

(2) b≠0


statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked;

statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked;

BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked;

EACH statement ALONE is sufficient to answer the question asked;

statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
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Source: — Data Sufficiency |

by GMATGuruNY » Wed Jun 25, 2014 2:12 pm
jbotero08 wrote: a^b=c

If a, b and c are integers, what is the value of a?

(1) c=1

(2) b≠0
When the statements are combined, it's possible that a=1 and b=2 or that a=-1 and b=2.
Since a can be different values, the two statements combined are INSUFFICIENT.

The correct answer is E.
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by jbotero08 » Thu Jun 26, 2014 11:22 am
Thank you.

Your post make sense.

BTW is there any guide or book you recommend to improve on quant generally?
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