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sampath: Senior | Next Rank: 100 Posts; Posts: 49; Joined: Thu May 19, 2011 9:20 pm

by sampath » Tue Jul 05, 2011 10:47 pm

Is A^B positive?
1. B^A is positive
2. B is negative

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Source: Beat The GMAT — Data Sufficiency | Tue Jul 05, 2011 10:47 pm

Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members; Location: India; Thanked: 375 times

by Frankenstein » Tue Jul 05, 2011 11:03 pm

Hi,
From(1):
if b=-3, a=2, a^b = 1/8 (positive)
if b=-3, a=-2, a^b = -1/8 (negative)
Not sufficient
From(2):
if b=-3, a=2, a^b = 1/8 (positive)
if b=-3, a=-2, a^b = -1/8 (negative)
Not sufficient
Both(1) and (2):
if b=-3, a=2, a^b = 1/8 (positive)
if b=-3, a=-2, a^b = -1/8 (negative)
Not sufficient

Hence, E

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amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Fri Jul 08, 2011 2:26 am

a b=a=1 and b=-1,a=-2 gives different results. not sufficient.

b b=-1 a= +|- 1 gives different results too. not sufficient.

a+b
b=-1 and a= +|-2 gives different results too.
not sufficient.

hence E it is.

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