500 ds

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Wed Apr 04, 2007 1:46 pm

hI,

I thought the answer is C) cause 64 could be X and meet the requirements - but the answer was E)... can anyone explain please??

. Is x an even integer?
(1) x is the square of an integer.
(2) x is the cube of an integer.

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Source: Beat The GMAT — Data Sufficiency | Wed Apr 04, 2007 1:46 pm

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member; Location: Silicon valley, California; Thanked: 30 times

by jayhawk2001 » Wed Apr 04, 2007 8:35 pm

1 - insufficient. 2^2 = 4 and 3^2 = 9.

2 - insufficient. 2^3 = 8 and 3^3 = 27

1 and 2 together is insufficient as well. A simple test would be to
try 2^6 and 3^6

2^6 = (2^3)^2 or (2^2)^3 = even
3^6 = (3^3)^2 or (3^2)^3 = odd

Hence E

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