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Can someone please, explain my mistake:

Which of the following could be p if |3p – 4| < 1?

A. 1/4 B. 5/4 C. 5/3 D. 0 E. 2

a. |3p – 4| < 1; 3p < 1 + 4; p <5/3

b. |3p – 4| < 1; 3p <-1 + 4; p < 3/3; p < 1

I selected 1/4, being more restricitive.
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hero_with_1000_faces
Can someone please, explain my mistake:

Which of the following could be p if |3p – 4| < 1?

A. 1/4 B. 5/4 C. 5/3 D. 0 E. 2

a. |3p – 4| < 1; 3p < 1 + 4; p <5/3

b. |3p – 4| < 1; 3p <-1 + 4; p < 3/3; p < 1

I selected 1/4, being more restricitive.
Highlighted part is incorrect.

If you open brackets with a < sign. . .

Case 1: absolute value < RHS
3P - 4 < 1
3P < 5
P < \(\frac{5}{3}\)

Case 2: absolute value > -RHS
3P - 4 > -1
3P > 3
P > 1

and
P < \(\frac{5}{3}\)

1 < P < \(\frac{5}{3}\)

P has to fall between 1 and \(\frac{5}{3}\)

Only \(\frac{5}{4}\) does that.

0 and \(\frac{1}{4}\) are too small.

\(\frac{5}{3}\) and 2 are too great.

Easy mistake to make in the arithmetic. :-) Hope that helps
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generis Thank you for your kind explanation. I have read Manhattan, gone through magoosh videos and still had a flawed understanding. Thank You.




generis
hero_with_1000_faces
Can someone please, explain my mistake:

Which of the following could be p if |3p – 4| < 1?

A. 1/4 B. 5/4 C. 5/3 D. 0 E. 2

a. |3p – 4| < 1; 3p < 1 + 4; p <5/3

b. |3p – 4| < 1; 3p <-1 + 4; p < 3/3; p < 1

I selected 1/4, being more restricitive.
Highlighted part is incorrect.

If you open brackets with a < sign. . .

Case 1: absolute value < RHS
3P - 4 < 1
3P < 5
P < \(\frac{5}{3}\)

Case 2: absolute value > -RHS
3P - 4 > -1
3P > 3
P > 1

and
P < \(\frac{5}{3}\)

1 < P < \(\frac{5}{3}\)

P has to fall between 1 and \(\frac{5}{3}\)

Only \(\frac{5}{4}\) does that.

0 and \(\frac{1}{4}\) are too small.

\(\frac{5}{3}\) and 2 are too great.

Easy mistake to make in the arithmetic. :-) Hope that helps
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Bunuel
Which of the following could be p if |3p – 4| < 1?

A. 1/4
B. 5/4
C. 5/3
D. 0
E. 2

Scanning our answer choices, we see that answer choice B is correct.

|3(5/4) - 4| < 1

|15/4 - 4| < 1

|15/4 - 16/4| < 1

|-1/4| < 1

1/4 < 1

Alternate Solution:

In order for the absolute value of an expression to be less than 1, the value of the expression itself must be between -1 and 1; in other words, we must have:

-1 < 3p - 4 < 1

3 < 3p < 5

1 < p < 5/3

5/4 is the only value amongst the answer choices that is included in this interval.

Answer: B
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