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Data Sufficiency Questions

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Intern
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Joined: 29 Jun 2008
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Data Sufficiency Questions [#permalink]

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Hi All,

Please help me to resolve following 3 Data Sufficiency Questions:

Question 1:

If K is not equal to 0,1,-1; Is 1/K > 0?

1. 1/k+1 > 0.
2. 1/k-1 >0.

Question 2:

Is the integer n a multiple of 15?

1. n is a multiple of 20.
2. n + 6 is a multiple of 3.

Question 3:

Is x*x*x*x + y*y*y*y > z*z*z*z?

1. x*x + y*y > z*z
2. x + y > z.

Answers:

1. A.
2. C.
3. E.

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

1 KUDOS received
Retired Moderator
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B
Joined: 05 Jul 2006
Posts: 1749

Kudos [?]: 443 [1], given: 49

GMAT ToolKit User Premium Member
Re: Data Sufficiency Questions [#permalink]

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New post 09 Aug 2009, 00:30
1
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Question 1:

If K is not equal to 0,1,-1; Is 1/K > 0? ie: is k +ve

1. 1/k+1 > 0.
2. 1/k-1 >0.

from 1
k+1>0 ie: k>-1....insuff

from 2

k-1>0 , k>1 ..sufff

B

Question 2:

Is the integer n a multiple of 15? DOES N HAS 5,3 as factors

1. n is a multiple of 20.
2. n + 6 is a multiple of 3.
from 1
n has 4,5 as factors... insuff
from2
n has 3 as factor...insuff
both
suff...C

Question 3:

Is x*x*x*x + y*y*y*y > z*z*z*z? is x^4+y^4>z^4

1. x*x + y*y > z*z
2. x + y > z.

try plugging in numbers it is impossible to prove...E
Answers:

1. A...... i think the answer should be B not A
2. C.
3. E.[/quote]

Kudos [?]: 443 [1], given: 49

1 KUDOS received
Manager
Manager
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Status: Applying
Joined: 19 Jul 2009
Posts: 148

Kudos [?]: 16 [1], given: 6

Location: United Kingdom
Concentration: General Management, Strategy
GPA: 3.65
WE: Consulting (Telecommunications)
Re: Data Sufficiency Questions [#permalink]

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New post 10 Aug 2009, 03:03
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I agree with the conclusion drawn above ...

1) B
2) C
3) E

Kudos [?]: 16 [1], given: 6

Re: Data Sufficiency Questions   [#permalink] 10 Aug 2009, 03:03
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