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rchuck21 wrote:
Hi Ravikant,

This sum is similar to problem 166 of OG for GMAT Review, 11th Edition -> Problem Solving Sample Questions. Look into the solution as it is beautifully explained with a grid. The approach is wonderful and can be applied to any such problem which has multiple groups to choose from.

The answer is 5 ...... Option (E)

thanx rahul for pointing out a similar sum...it has indeed been explained beautifully !!..

keep helping us guys...am getting to learn a lot...

rchuck21 wrote:
At least 4 Years Experience Less than 4 Years Experience Total
Degrees 5 13 18
No Degrees 9 3 12
14 16 30

Answer 5

perfect answer !!...u already have provided the solution..

basically, 3 of them neither have 4 years experience nor a degree...
now its basically intersection of 2 sets..

30 = 14 + 18 -both + 3.
hence both = 5...Ans

Q-1 In a group of 68 students, each student is registered for at least one of three classes – History, Math and English. Twenty-five students are registered for History, twenty-five students are registered for Math, and thirty-four students are registered for English. If only three students are registered for all three classes, how many students are registered for exactly two classes?

A. 19
B. 13
C. 10
D. 8
E. 7


Bhavin, could u pls provide a video solution of this problem uding venn diagram......

binish wrote:
Q-1 In a group of 68 students, each student is registered for at least one of three classes – History, Math and English. Twenty-five students are registered for History, twenty-five students are registered for Math, and thirty-four students are registered for English. If only three students are registered for all three classes, how many students are registered for exactly two classes?

A. 19
B. 13
C. 10
D. 8
E. 7


Bhavin, could u pls provide a video solution of this problem uding venn diagram......

Hey Binish,

Look at the GMAT QOTD section of this forum.
Find the QOTD for 11th of June. A similar problem has been discussed.

The _link_ is below for your reference:

http://score-plus.com/forum/gmat-question-of-the-day/2008-06-11-problem-solving/view-4.html

Hope this helps.

I haven't drawn the Venn diagram to solve the question. Haven't solved it too. Just subtracted 6 (2*3) from 19 (87-68) following the logic from the QOTD to come at 13 .... Option (b)

Hence, not sure abt the answer

Would request Bhavin to clarify.

Warm rgds,
Rahul.

rchuck21 wrote:
binish wrote:
Q-1 In a group of 68 students, each student is registered for at least one of three classes – History, Math and English. Twenty-five students are registered for History, twenty-five students are registered for Math, and thirty-four students are registered for English. If only three students are registered for all three classes, how many students are registered for exactly two classes?

A. 19
B. 13
C. 10
D. 8
E. 7


Bhavin, could u pls provide a video solution of this problem uding venn diagram......

Hey Binish,

Look at the GMAT QOTD section of this forum.
Find the QOTD for 11th of June. A similar problem has been discussed.

The _link_ is below for your reference:

http://score-plus.com/forum/gmat-question-of-the-day/2008-06-11-problem-solving/view-4.html

Hope this helps.

I haven't drawn the Venn diagram to solve the question. Haven't solved it too. Just subtracted 6 (2*3) from 19 (87-68) following the logic from the QOTD to come at 13 .... Option (b)

Hence, not sure abt the answer

Would request Bhavin to clarify.

Warm rgds,
Rahul.

Hey Rahul...good to have you back!! for a moment i feared we have lost the most active member of this thread...

Excellent that u have pointed out a similar sum...but are these questions exactly similar ?? its all about reading between the lines...

try again...i am sure u would be able to spot the difference ...similar approaches, different needs !! ..

will get back to this explanation in few hours !!

Happy solving !!

Hey Bhavin.

Thanks!! I feel bad that I am not able to log in to the forum as I used to do before. My preps have also hit a road block as work pressure has gone up. But I am trying Lets see....

Always good to see you on the forum.

Thanks for pointing out the subtle difference.
Taking an excerpt from the solution you had provided to the QOTD before:

no. of ppl registering for exactly 2 classes = Only Grp 12 + Only Grp 13 + Only Grp 23
And, Grp12 + Grp13+ Grp23 = Only Grp 12 + Only Grp 13 + Only Grp 23 + 3 Grp 123
=> Only Grp 12 + Only Grp 13 + Only Grp 23 = 19 - 3(3) =10

Option (C).