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Which of the following could be n if |2n – 3| < 1?

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Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 14 Dec 2016, 06:01
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

77% (00:44) correct 23% (00:55) wrong based on 202 sessions

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Re: Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 14 Dec 2016, 08:21
Bunuel wrote:
Which of the following could be n if |2n – 3| < 1?

A. -4/3
B. -1
C. 4/3
D. 1
E. 0


Plug in the values of n from the options and check -

A. If n = -4/3 ; |2n – 3| = 5.67

B. If n = -1 ; |2n – 3| = 5

C. If n = 4/3 ; |2n – 3| = 1/3 < 1

D. If n = 1 ; |2n – 3| = 1

E. If n = 0 ; |2n – 3| = 3

Hence, answer will be (C)

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Re: Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 14 Dec 2016, 09:42
Bunuel wrote:
Which of the following could be n if |2n – 3| < 1?

A. -4/3
B. -1
C. 4/3
D. 1
E. 0



sq. both sides to get
4n^2+9-12n<1
4n^2-12n+8<0
(2n-2)(n-4)<0

so break even points are 1 & 4 (shown below)
any number between 1& 4 willsatisfy the equation asked

thus 4/3 lies in between 1 & 4 will be answer

Ans C
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Re: Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 15 Dec 2016, 17:52
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Expert's post
Bunuel wrote:
Which of the following could be n if |2n – 3| < 1?

A. -4/3
B. -1
C. 4/3
D. 1
E. 0


Let’s solve the given inequality for when (2n - 3) is positive and then when (2n - 3) is negative.

When (2n - 3) is positive, we have:

2n - 3 < 1

2n < 4

n < 2

Now we can solve for when (2n - 3) is negative:

-(2n - 3) < 1

-2n + 3 < 1

-2n < -2

n > 1

Thus, 1 < n < 2, so n could equal 4/3.

Answer: C
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Re: Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 01 Jan 2017, 16:08
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-1 <2n - 3< 1
3-1 < 2n < 1+3
\(\frac{2}{2} < n < \frac{4}{2}\)
1 < n < 2
C
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Re: Which of the following could be n if |2n – 3| < 1? [#permalink]

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New post 12 Nov 2017, 11:27
kanusha wrote:
-1 <2n - 3< 1
3-1 < 2n < 1+3
\(\frac{2}{2} < n < \frac{4}{2}\)
1 < n < 2
C



This is by far the fastest method and should take no more than 30 seconds.
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Re: Which of the following could be n if |2n – 3| < 1?   [#permalink] 12 Nov 2017, 11:27
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Which of the following could be n if |2n – 3| < 1?

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