Gmat prep divisibility

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Vignesh.4384: Master | Next Rank: 500 Posts; Posts: 443; Joined: Sat Jun 28, 2008 6:33 pm; Thanked: 5 times

Gmat prep divisibility

by Vignesh.4384 » Mon Aug 25, 2008 7:14 pm

Hi can any one solve this?

OA = E

But i thought B was enough to conclude.

Please explain

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Source: Beat The GMAT — Data Sufficiency | Mon Aug 25, 2008 7:14 pm

sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

Re: Gmat prep divisibility

by sudhir3127 » Mon Aug 25, 2008 8:34 pm

Vignesh.4384 wrote:Hi can any one solve this?

OA = E

But i thought B was enough to conclude.

Please explain

I go with B as well..

In such type of question u shud be able to answer either YES or NO.

statement 1. k is divisible by 4.

if its 64 then Yes and if its 12 then its NO.

hence insufficient.

Statement 2. Exactly 4 different prime factors.

take 2*3*5*7 = 210 ..NO .. and its no for all the numbers.

Hence B

hope that helps..

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Vignesh.4384: Master | Next Rank: 500 Posts; Posts: 443; Joined: Sat Jun 28, 2008 6:33 pm; Thanked: 5 times

Re: Gmat prep divisibility

by Vignesh.4384 » Mon Aug 25, 2008 8:41 pm

sudhir3127 wrote:
Vignesh.4384 wrote:Hi can any one solve this?

OA = E

But i thought B was enough to conclude.

Please explain
I go with B as well..

In such type of question u shud be able to answer either YES or NO.

statement 1. k is divisible by 4.

if its 64 then Yes and if its 12 then its NO.

hence insufficient.

Statement 2. Exactly 4 different prime factors.

take 2*3*5*7 = 210 ..NO .. and its no for all the numbers.

Hence B

hope that helps..

I am just curious cos the official OA says E .
U think GMAT prep answer could be wrng ?
Please see the attachment below

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

Re: Gmat prep divisibility

by sudhir3127 » Mon Aug 25, 2008 8:52 pm

sudhir3127 wrote:
Vignesh.4384 wrote:Hi can any one solve this?

OA = E

But i thought B was enough to conclude.

Please explain
I go with B as well..

In such type of question u shud be able to answer either YES or NO.

statement 1. k is divisible by 4.

if its 64 then Yes and if its 12 then its NO.

hence insufficient.

Statement 2. Exactly 4 different prime factors.

take 2*3*5*7 = 210 ..NO .. and its no for all the numbers.

Hence B

hope that helps..

hey sorrie abt that confusion...

Its E as the OA says..

as i said A is insufficent..

Statement 2. if we consider the number 2^2*3^2*5^2*7^2.. then its a perfect square (210)^2..

Again this is Yes and No.. so insufficient.

together as well its insufficent.

Hence E.

do let me know if u have any doubts...