Manhattan GMAT Challenge - Crack GMAT with one Question Every Week

inblue

E for me too
PS : subscribing to this thread.

anujrk

E for me too.....

akrant

yup E is the answer as there are two numbers below 30 tht exibit the property of perfect number..
The two on their own also cannot give a correct answer

pinu

i choose option E..
wud like to know how to get the answer in the least possible time..
thanx
pinu

praveen82_2000

Quote:

Originally Posted by KevinFitzgerald

Most of our students are trying to break the 700+ barrier. As a result, we've developed our own math problems written at the 700+ level; these are the types of questions you'll WANT to see, when you are working at that level. Try to solve this 700+ level Data Sufficiency problem (I'll post the solution next Monday).

Question
What is the positive integer n ?

(1) The sum of all of the positive factors of n that are less than n is equal to n
(2) n < 30

(A) Statement (1) ALONE is sufficient to answer the question, but statement (2) alone is not.
(B) Statement (2) ALONE is sufficient to answer the question, but statement (1) alone is not.
(C) Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient to answer the question.
(E) Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question.

The Answer is option E . There are basically 2 numbers 6 and 28 which satisfy the condition.

rajat_nda

as already discussed num are perfect numbers...more tha one so E
my point is: if someone could post a list of perfect num...it would be a big help
what say??
herz mine--->> 2, 6, 496....plz continue this

Run Time Error

Quote:

Originally Posted by praveen82_2000

The Answer is option E . There are basically 2 numbers 6 and 28 which satisfy the condition.

Isnt 1 a perfect number?

vitenite

Hi,

I havbe a very basic doubt here...when you mean Sum of all positive factors is less than n...how do you interpret that?

Sorry but a lil confused here

Regards,

vitenite

Quote:

Originally Posted by vitenite

Hi,I have a very basic doubt here...when you mean Sum of all positive factors is less than n...how do you interpret that? I mean u factorise it completley and add it up right?
Sorry but a lil confused here

eg: for 15 we can factorize it as 5*3 or 15*1
factors are 5,3,1 right?
My best guess is neither is enough...E
Regards,

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