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Is y between 1 and 2, exclusive?

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Is y between 1 and 2, exclusive?  [#permalink]

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New post 29 Aug 2016, 03:01
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  45% (medium)

Question Stats:

65% (01:46) correct 35% (01:50) wrong based on 46 sessions

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Is y between 1 and 2, exclusive?  [#permalink]

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New post 29 Aug 2016, 13:17
Bunuel wrote:
Is y between 1 and 2, exclusive?

(1) y^2 is less than y
(2) y^2 + y is between 1 and 2, exclusive


From statement 1 :

The only time the square of a number is smaller than the number is when the number is a fraction between 0 and 1 (when denominator is greater than numerator)

Since Y^2 is less than y , y must fall between 0 and 1 so clearly not between 1 and 2. Sufficient

From statement 2:

y(y+1) is between 1 and 2 , exclusive

Let's take y=1

If y=1, y(y+1) = 2

so y is less than 1 hence not between 1 and 2. Sufficient

Aanswer D

Hope this is correct I suck at inequalities :oops:
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Re: Is y between 1 and 2, exclusive?  [#permalink]

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New post 29 Aug 2016, 14:33
St 1: if y^2 < y, then y has to be a positive proper fraction. So 0<y<1.

Sufficient

St 2: if 1<y<2 , then 2< y^2+y <6;
But as per statement, 1 < y^2+y < 2.
Therefore, y is not within the range of 1 and 2.

Sufficient.

D


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Re: Is y between 1 and 2, exclusive?  [#permalink]

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New post 30 Aug 2016, 08:18
Statement 1:

The only time the square of a number is smaller than the number is when the number is a fraction between 0 and 1, i.e 0<Y<1

so clearly Y doesn't fall between 1 and 2. Sufficient

Statement 2:

Any number greater than 1 when squared upon and added to itself will result in a value greater than 2. Hence Y cant between 1 and 2.


If \(Y\)=1,\(Y^2\)= 1 ; \(Y\)+\(Y^2\) = 2, hence its not in the range (1<Y<2),

If \(Y\)=1.5 , \(Y^2\)= 1.25 ; \(Y\)+\(Y^2\)= 2.25, hence its not in the range (1<Y<2).

SO, Sufficient

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Is y between 1 and 2, exclusive?  [#permalink]

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New post 18 Jul 2018, 03:10
Bunuel wrote:
Is y between 1 and 2, exclusive?

(1) y^2 is less than y
(2) y^2 + y is between 1 and 2, exclusive


Dear Moderator,

Although I got this correct , still I may be missing something .

for statement 1: 0 <y <1

for statement 2 if Y = 1/2 then y^2 + y is between 1 and 2, exclusive is not satisfied


for statement 2, y seems to be : -2 < y <-1

Arn't the two statements contradicting each other?
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Is y between 1 and 2, exclusive? &nbs [#permalink] 18 Jul 2018, 03:10
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