NEW HERE? LEARN MORE
closeclose
It is currently 23 Apr 2024, 01:13
Register
GMAT Focus Tests
Decision Tracker
My Rewards
New posts
New comers' posts

Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Is MNP isosceles? (1) Exactly two of the angles, M and N, have the

8 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Question banks

GMAT Question Banks

Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
User avatar
L
GMATBusters
GMAT Tutor
Joined: 27 Oct 2017
Posts: 1907
WE:General Management (Education)
GMAT ToolKit User
Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  14 Nov 2018, 09:39
2
Kudos
13
Bookmarks
Expert Reply
00:00
A
B
C
D
E

Difficulty:

5% (low)

Question Stats:

85% (00:30) correct 15% (00:37) wrong based on 648 sessions
Hide Show timer Statistics
Is ΔMNP isosceles?

(1) Exactly two of the angles, ∠M and ∠N, have the same measure
(2) ∠N and ∠P do not have the same measure.
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

_________________
Contact me at quantbusters at gmail.com for Live GMATPrep tutoring sessions.
Signature Read More
request expert reply
User avatar
P
nkin
Manager
Manager
Joined: 09 Jun 2018
Posts: 170
Location: United States
Schools: Booth '22 (WA) Ross '22 (WL) Tuck '22 (WL) Duke '22 (WL) Darden '22 (A$) Kellogg '22 (A)
GMAT 1: 730 Q50 V39
GPA: 4
WE:Operations (Manufacturing)
GMAT ToolKit User Reviews Badge
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  14 Nov 2018, 09:48
Stmt 1: States that 2 angles are equal, hence the triangle is isosceles. Sufficient.

Stmt 2: States that 2 angles are not equal, does not tell us if the other remaining angle is equal to any of these two. Not Sufficient.

Hence Option A
User avatar
S
shibsz
Intern
Intern
Joined: 23 May 2018
Posts: 35
Location: India
Concentration: Economics, Strategy
Schools: Ivey '22 (A$)
GMAT 1: 690 Q48 V36
GPA: 4
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  14 Nov 2018, 10:17
S1 : Angle M=Angle N => MP=NP
Now, if MP=NP=MN, it's an equilateral triangle.
But, if MP/NP!=MN, it's an isoceles triangle.
Hence, NS.

S2 : Angle N!= Angle P => MN!=MP.
No info about 3rd side.
It could be an Isoceles Triangle or an Acute or an Obtuse Triangle.
Hence, NS.

Both S1 & S2 together => SUFFICIENT.
Since 2 sides MP and NP are equal and third side MN is not equal.

Ans = C

Posted from my mobile device
User avatar
P
nkin
Manager
Manager
Joined: 09 Jun 2018
Posts: 170
Location: United States
Schools: Booth '22 (WA) Ross '22 (WL) Tuck '22 (WL) Duke '22 (WL) Darden '22 (A$) Kellogg '22 (A)
GMAT 1: 730 Q50 V39
GPA: 4
WE:Operations (Manufacturing)
GMAT ToolKit User Reviews Badge
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  14 Nov 2018, 10:25
shibanis01 wrote:
S1 : Angle M=Angle N => MP=NP
Now, if MP=NP=MN, it's an equilateral triangle.
But, if MP/NP!=MN, it's an isoceles triangle.
Hence, NS.

S2 : Angle N!= Angle P => MN!=MP.
No info about 3rd side.
It could be an Isoceles Triangle or an Acute or an Obtuse Triangle.
Hence, NS.

Both S1 & S2 together => SUFFICIENT.
Since 2 sides MP and NP are equal and third side MN is not equal.

Ans = C

Posted from my mobile device


shibanis01 I believe, every equilateral triangle is isosceles, but not every isosceles triangle is equilateral. Here's a link that might help clarify: https://www.sparknotes.com/math/geometr ... /section3/
User avatar
D
exc4libur
SVP
SVP
Joined: 24 Nov 2016
Posts: 1720
Location: United States
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  06 Sep 2019, 03:31
1
Bookmarks
nkin wrote:
shibanis01 wrote:
S1 : Angle M=Angle N => MP=NP
Now, if MP=NP=MN, it's an equilateral triangle.
But, if MP/NP!=MN, it's an isoceles triangle.
Hence, NS.

S2 : Angle N!= Angle P => MN!=MP.
No info about 3rd side.
It could be an Isoceles Triangle or an Acute or an Obtuse Triangle.
Hence, NS.

Both S1 & S2 together => SUFFICIENT.
Since 2 sides MP and NP are equal and third side MN is not equal.

Ans = C

Posted from my mobile device


shibanis01 I believe, every equilateral triangle is isosceles, but not every isosceles triangle is equilateral. Here's a link that might help clarify: https://www.sparknotes.com/math/geometr ... /section3/


(1) Exactly two of the angles, M and N, have the same measure.
"Exactly two" means that the triangle cannot be an equilateral, since ONLY 2 angles can be the same.
User avatar
L
BrentGMATPrepNow
GMAT Club Legend
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 6821
Location: Canada
Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  14 Feb 2020, 08:09
Expert Reply
Top Contributor
GMATBusters wrote:
Is triangle MNP isosceles?

(1) Exactly two of the angles, M and N, have the same measure.
(2)Angles N and P do not have the same measure.

Target question: Is triangle MNP isosceles?

Statement 1: Exactly two of the angles, M and N, have the same measure.
Perfect. This is the precise definition of an isosceles triangle
The answer to the target question is YES, triangle MNP is isosceles
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: Angles N and P do not have the same measure
Here are two conflicting scenarios that satisfied statement 2
Case a: ∠N = 50°, ∠P = 80°, and ∠M = 50°. In this case, the answer to the target question is YES, triangle MNP is isosceles
Case b: ∠N = 50°, ∠P = 70°, and ∠M = 60°. In this case, the answer to the target question is NO, triangle MNP is not isosceles
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Answer: A

Cheers,
Brent­
User avatar
P
kungfury42
Director
Director
Joined: 07 Jan 2022
Posts: 608
Schools: NUS '25 (A)
GMAT 1: 740 Q51 V38
GPA: 4
Reviews Badge
Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  17 Feb 2022, 10:54
GMATBusters wrote:
Is triangle MNP isosceles?


(1) Exactly two of the angles, M and N, have the same measure.

(2)Angles N and P do not have the same measure.

(1) Exactly two angles have the same measure. Sufficient.

(2) Two angles not having the same measure gives us no information about the third angle. Insufficient.

Hence, A.­
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32611
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink] New post  02 Apr 2024, 21:33
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources
Signature Read More
GMAT Club Bot
gmatclubot
Re: Is MNP isosceles? (1) Exactly two of the angles, M and N, have the [#permalink]
02 Apr 2024, 21:33
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderator:
Bunuel
Math Expert
92847 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions