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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

25 Aug 2017, 01:57

1

This post received KUDOS

We know that sum of any two sides of a triangle is greater than the side

hence if the length of a side is 9 then sum of the other two sides will 9 considering the perimeter as 18 under given condition the above scenario is not possible hence the answer is E

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

26 Aug 2017, 13:02

Bunuel wrote:

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

I understand why E is the answer. But why not option A ? if one side is 1, the other two sides will be 8 and 9. These cannot be the sides of the triangle. Can someone please explain?

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

27 Aug 2017, 00:55

hwgmat2015 wrote:

Bunuel wrote:

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

I understand why E is the answer. But why not option A ? if one side is 1, the other two sides will be 8 and 9. These cannot be the sides of the triangle. Can someone please explain?

Yes, why not A?the other two sides can be 10 and 7 as well.

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

27 Aug 2017, 01:26

it can not be A let us take the case of an equilateral triangle perimeter is given to be 18 mm So each side would be 6 mm Now we have property of the triangle = a-b<c<a+b Since each side is equal a-b=0 a+b=12 so 0<c<12 but we know that perimeter is 18 so C<=6 I hope it is clear
_________________

We are more often frightened than hurt; and we suffer more from imagination than from reality

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

27 Aug 2017, 02:49

Bunuel wrote:

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

I need help

A) 1 should be greater than SUM OF OTHER 2 SIDES and Less than SUBTRACTION OF 2 SIDES

So if one side is 1 other 2 will be x+y = 17 (well it satisfies that 3rd side should be less than addition of rest 2 so 1 is valid) But for subtraction? Lets take x= 9 , y =8 , SO 9-8 = 1 , HENCE IT SHOULD BE GREATER THAN 1 to satisfy second condition but its equal to 1 then

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

I need help

A) 1 should be greater than SUM OF OTHER 2 SIDES and Less than SUBTRACTION OF 2 SIDES

So if one side is 1 other 2 will be x+y = 17 (well it satisfies that 3rd side should be less than addition of rest 2 so 1 is valid) But for subtraction? Lets take x= 9 , y =8 , SO 9-8 = 1 , HENCE IT SHOULD BE GREATER THAN 1 to satisfy second condition but its equal to 1 then

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

27 Aug 2017, 03:31

chetan2u wrote:

rocko911 wrote:

Bunuel wrote:

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

I need help

A) 1 should be greater than SUM OF OTHER 2 SIDES and Less than SUBTRACTION OF 2 SIDES

So if one side is 1 other 2 will be x+y = 17 (well it satisfies that 3rd side should be less than addition of rest 2 so 1 is valid) But for subtraction? Lets take x= 9 , y =8 , SO 9-8 = 1 , HENCE IT SHOULD BE GREATER THAN 1 to satisfy second condition but its equal to 1 then

Re: If the perimeter of a triangle is 18, then the length of one of the [#permalink]

Show Tags

27 Aug 2017, 04:40

Bunuel wrote:

If the perimeter of a triangle is 18, then the length of one of the sides CANNOT be

(A) 1 (B) 3 (C) 6 (D) 8 (E) 9

Here E must be the answer. as we know the sum of two sides must be greater than the third side. so if one side is 9 so sum of other two side will also be 9 and it violates rules mentioned earlier Hence E
_________________

You have to have the darkness for the dawn to come.