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If n and x are positive integers, what is the least common multiple of

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V
Joined: 02 Sep 2009
Posts: 52315
If n and x are positive integers, what is the least common multiple of  [#permalink]

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New post 28 Apr 2016, 02:33
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

65% (01:55) correct 35% (02:02) wrong based on 155 sessions

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B
Joined: 01 Jul 2010
Posts: 62
Location: India
GMAT 1: 660 Q43 V38
GPA: 3.4
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Re: If n and x are positive integers, what is the least common multiple of  [#permalink]

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New post 28 Apr 2016, 03:39
1
From the question stem we can infer
192 = 2^6*3
45n = 3^2*5*n

Stmnt 1
n=2^x
Depending upon the value of x the LCM (192,45n) can have different answers
Insufficient

Stmnt 2
n is prime so n can be 2,3,5,7 etc
Depending on the value of n LCM(192,45n) can have different answers
InSufficient

Stmnt 1 +2
This means that n can have only one value 2
So LCM (192,90) will be one single value
Sufficient

Ans C
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Re: If n and x are positive integers, what is the least common multiple of  [#permalink]

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New post 20 Jul 2017, 11:46
Bunuel wrote:
If n and x are positive integers, what is the least common multiple of 192 and 45n?

(1) n = 2^x
(2) n is a prime.


We need to find the value of n.

1) n = \(2^x\)
n = 2, 4, 8,.... etc.
Insufficient.

2) n is prime
n = 2,3,5,7,... etc.
Insufficient.

1+2)
n = \(2^x\) and n is prime
=> x = 1 and n = 2
LCM (192,90) = Some unique number.
Sufficient.

C is the answer.
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Re: If n and x are positive integers, what is the least common multiple of  [#permalink]

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New post 30 Aug 2018, 05:29
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If n and x are positive integers, what is the least common multiple of &nbs [#permalink] 30 Aug 2018, 05:29
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