| View previous topic :: View next topic |
| Author |
Message |
sandeep_chhabra
Rising GMAT Star
Joined: 01 Feb 2008
Posts: 73
Thanks given: 1
Thanked 0 times in 0 posts
Location: India
Test Date: 22nd May 2008
Target GMAT Score: 650
|
 Posted: Sat May 10, 2008 8:31 am Post subject: GMAT Prep Test 1 Q33 |
 |
|
Need some help on this ...
|
|
| Back to top |
|
 |
|
|
akshatsingh
Rising GMAT Star
Joined: 10 Apr 2008
Posts: 77
Thanks given: 0
Thanked 3 times in 3 posts
|
| Posted: Sun May 11, 2008 11:46 pm Post subject: |
|
|
1) The sum of two digits of n is prime
n=83
n=29
Not Sufficent
2) Each of the two digts is prime.
8 and 9 are not prime. So n cannot be greater than 80.
Sufficent.
My answer is B.
_________________
Aks |
|
| Back to top |
|
|
sandeep_chhabra
Rising GMAT Star
Joined: 01 Feb 2008
Posts: 73
Thanks given: 1
Thanked 0 times in 0 posts
Location: India
Test Date: 22nd May 2008
Target GMAT Score: 650
|
| Posted: Mon May 12, 2008 1:08 am Post subject: |
|
|
Got it now.....
Thanks
|
|
| Back to top |
|
|
II
GMAT Destroyer!
Joined: 10 Dec 2007
Posts: 358
Thanks given: 10
Thanked 11 times in 8 posts
Location: London, UK
Test Date: Sept/Oct 2008
Target GMAT Score: 700
GMAT Score: 580
|
| Posted: Mon May 12, 2008 1:23 pm Post subject: |
|
|
| akshatsingh wrote: |
2) Each of the two digts is prime.
8 and 9 are not prime. So n cannot be greater than 80.
Sufficent.
My answer is B. |
Another way of looking at this:
We know that the following are the single-digit prime numbers: 2, 3, 5, and 7.
So if each of the 2 digits is prime, then the maximum value we can have is 77. This is less than 80 ... so n < 80. SUFFICIENT. Answer B.
What is the Official answer ?
|
|
| Back to top |
|
|
Alejandro
Just gettin' started!
Joined: 17 May 2008
Posts: 4
Thanks given: 0
Thanked 0 times in 0 posts
Location: Mexico
Test Date: 29/05/08
Target GMAT Score: 750
|
| Posted: Mon May 19, 2008 7:41 pm Post subject: |
|
|
| ok , but consider this, the first statement says that the sum of the 2 digits also is prime number, if you take in count this 2+3=5 so the number could be 23 that is less than 80, maybe the answer could be c, what do you think?
|
|
| Back to top |
|
|
|
|
akshatsingh
Rising GMAT Star
Joined: 10 Apr 2008
Posts: 77
Thanks given: 0
Thanked 3 times in 3 posts
|
| Posted: Tue May 20, 2008 3:14 am Post subject: |
|
|
Experts say that if either of A or B is sufficent .. D can be a possibilty but not C.
best advise would be to read the instructions little more carefully.. jsut once 
_________________
Aks |
|
| Back to top |
|
|
|
