Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 May 2015, 20:13

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# In a sequence of 13 consecutive integers, all of which are

Author Message
TAGS:
Manager
Joined: 09 May 2006
Posts: 99
Location: Bangalore, India
Followers: 2

Kudos [?]: 12 [0], given: 0

In a sequence of 13 consecutive integers, all of which are [#permalink]  18 Jun 2006, 21:58
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
In a sequence of 13 consecutive integers, all of which are less than 100, there are exactly 3 multiples of 6. How many integers in the sequence are prime?

(1) Both of the multiples of 5 in the sequence are also multiples of either 2 or 3.

(2) Only one of the two multiples of 7 in the sequence is not also a multiple of 2 or 3.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5077
Location: Singapore
Followers: 22

Kudos [?]: 186 [0], given: 0

St1:
1-13: Out. Only two multiple of 6
6-18: 3 multiples of 6, two multiples of 5 are also multiples of 2 or 3. --> 4 primes
12-24: 3 multiples of 6, 2 multiples of 5 are also multiples of 2 or 3 --> 4 primes

Should always end up with 4 primes. Sufficient.

St2:
6-18: 3 multiples of 6, two muliples of 7, and one is not a multiple of 2/3 --> 4 primes

Can't think of any other series that satisfies the criteria set in st2. Should be be just 6-18. In any case, the number of primes integers in this set = 4. Sufficient.

I am going with D
Senior Manager
Joined: 09 Mar 2006
Posts: 445
Followers: 1

Kudos [?]: 6 [0], given: 0

66-78 satisfy stmt. 1 ( 3 primes )

48-60 satisfy stmt. 2 ( 3 primes )

So taken alone they are not sufficient
Manager
Joined: 09 May 2006
Posts: 99
Location: Bangalore, India
Followers: 2

Kudos [?]: 12 [0], given: 0

Gandalf if right. OA is C.
Senior Manager
Joined: 09 Mar 2006
Posts: 445
Followers: 1

Kudos [?]: 6 [0], given: 0

shobhitb wrote:
Gandalf if right. OA is C.

shobhitb

Manager
Joined: 09 May 2006
Posts: 99
Location: Bangalore, India
Followers: 2

Kudos [?]: 12 [0], given: 0

deowl wrote:
shobhitb wrote:
Gandalf if right. OA is C.

shobhitb

Sure deowl. Sorry if you were offended.
Senior Manager
Joined: 07 Jul 2005
Posts: 406
Location: Sunnyvale, CA
Followers: 2

Kudos [?]: 4 [0], given: 0

Although I could find hte answer, but is there any trick for such questions.. these questions really take time.
Director
Joined: 07 Jun 2006
Posts: 513
Followers: 10

Kudos [?]: 91 [0], given: 0

Re: DS - Mixed Bag [#permalink]  19 Jun 2006, 08:02
shobhitb wrote:
In a sequence of 13 consecutive integers, all of which are less than 100, there are exactly 3 multiples of 6. How many integers in the sequence are prime?

(1) Both of the multiples of 5 in the sequence are also multiples of either 2 or 3.

(2) Only one of the two multiples of 7 in the sequence is not also a multiple of 2 or 3.

Is this a plugging problem? this could take time. Any way to use number theory here to shorten the time? (for e.g. divisibility of last 2 digits, prime factors etc.)
_________________

http://onwardtomba.blogspot.com - MBA, GMAT, INSEAD - the journey.
My 7 GMAT Quant Strategies/Trap
My GMAT Debrief

Re: DS - Mixed Bag   [#permalink] 19 Jun 2006, 08:02
Similar topics Replies Last post
Similar
Topics:
24 If M is a sequence of consecutive integers which contains 10 20 May 2012, 21:49
5 In a sequence of 13 consecutive integers, all of which are 11 18 May 2010, 07:31
In a sequence of 13 consecutive integers, all of which are 4 02 Jul 2007, 02:01
2 In a sequence of 13 consecutive integers, all of which are 7 26 Oct 2006, 18:07
If a sequence of consecutive integers of increasing value 5 23 Oct 2006, 01:23
Display posts from previous: Sort by