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Is 30 the factor of n? 1). 30 is factor of n^2 2). 30 is

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Director
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Is 30 the factor of n? 1). 30 is factor of n^2 2). 30 is [#permalink] New post 21 Mar 2006, 15:37
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A
B
C
D
E

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Is 30 the factor of n?
1). 30 is factor of n^2
2). 30 is factor of 2n
Manager
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 [#permalink] New post 21 Mar 2006, 20:05
Me too for A.
But, can we assume that n is even?
I think we can since we are talking about factors here. But, just wanted to know other thoughts on this.
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 [#permalink] New post 22 Mar 2006, 02:33
I would choose D. Why do you think that statement II is insufficient? Picking numbers strategy works fine in this case.
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 [#permalink] New post 22 Mar 2006, 05:46
likar wrote:
I would choose D. Why do you think that statement II is insufficient? Picking numbers strategy works fine in this case.


for example : n =15 , 2n= 30 which has a factor of 30, but 15 doesn't
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 [#permalink] New post 22 Mar 2006, 14:50
I. n =sqrt(30) no
n =30 yes
insuff

II. n=15 no
n=30 yes

both
n can't equal 15. n has to be a multiple of 30. thus C. Any other explanaitions would be appreciated.
Senior Manager
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 [#permalink] New post 22 Mar 2006, 21:26
Ya, ya, das ist C!!!

a sqrt(30,60,90...) insuff.
b 15, 45, 75...insuff
  [#permalink] 22 Mar 2006, 21:26
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