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If x is an integer is x |x| < 2^x? 1. x > 0 2. x = 10

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Senior Manager
Senior Manager
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Joined: 10 Mar 2008
Posts: 356

Kudos [?]: 395 [0], given: 0

If x is an integer is x |x| < 2^x? 1. x > 0 2. x = 10 [#permalink]

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New post 18 Aug 2008, 13:16
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A
B
C
D
E

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Question Stats:

100% (01:28) correct 0% (00:00) wrong based on 1 sessions

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If x is an integer is x |x| < 2^x?

1. x > 0
2. x = 10

Kudos [?]: 395 [0], given: 0

Director
Director
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Joined: 12 Jul 2008
Posts: 514

Kudos [?]: 166 [0], given: 0

Schools: Wharton
Re: DS: Inequalities [#permalink]

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New post 18 Aug 2008, 13:19
vksunder wrote:
If x is an integer is x |x| < 2^x?

1. x > 0
2. x = 10


(1) Insufficient

If x = 1:
x|x| = 1
2^x = 2

If x = 2:
2|2| = 4
2^2 = 4

(2) Sufficient

Kudos [?]: 166 [0], given: 0

Current Student
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Joined: 28 Dec 2004
Posts: 3345

Kudos [?]: 325 [0], given: 2

Location: New York City
Schools: Wharton'11 HBS'12
Re: DS: Inequalities [#permalink]

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New post 18 Aug 2008, 13:20
i think B is correct..

1) x=1 is less than 2..but if x=3 then 9>8...

2) x=10 is suff

Kudos [?]: 325 [0], given: 2

Intern
Intern
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Joined: 15 Jul 2008
Posts: 5

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Re: DS: Inequalities [#permalink]

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New post 18 Aug 2008, 19:42
xIXI<2**10

1. x>o
x**2<2**x

so many values possible for x...........valid for all x <2........try 1, sqrt(2)....

2. x=10

10*I10I=100<2**10

B suff

Kudos [?]: [0], given: 0

Re: DS: Inequalities   [#permalink] 18 Aug 2008, 19:42
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If x is an integer is x |x| < 2^x? 1. x > 0 2. x = 10

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