Hey guys,
Here comes the problem:
QDS08429 Official Prep Software pack:
" <-----a------b------->
If a,b and c are three numbers on the number line shown above, is c between a and b?
(1) b < 0
(2) a - b > c
Correct answer: E
Official Answer explanation:
Determine if c lies between a and b on the number line.
(1) It is given that b < 0, but nothing is known about a and c; NOT Sufficient.
(2) Given that a - b > c, it is possible that c lies between a and b (for example, a = 0, b = -2, and c = -1) and it is possible that c does not lie between a and b (for example, a = 0, b = -2, and c = 1). NOT Sufficient.
Given both (1) and (2) together, the examples given in (2) above show that both statements together are not NOT sufficient to determine if c lies between a and b."
Thats why I think the answer explanation is seriously flawed:
Statement one: fully agree with.
Statement two: From my point of view, a point b right to a point a on the number line cannot be smaller than that point a. However, since b = -2 is smaller than a = 0 the authors of the test seem to disagree with my standpoint (see the boldfaced portions of the official answer explanation). Do I need enlightenment ?!
Nevertheless, since the reasoning seems fine, I would suggest picking the following values:
Statement 2: c can lie between a and b for the values a = - 4 , b = -2 and c = -3, then a - b = -2 > - 3 and c lies between a and b. On the other hand c can lie outside range a and b for the values a = -2 b = -1 c = -3, then a-b = -1 > - 3 and c does not lie between a and b.
Since both the values introduced in Statement two also satisfy the constraint in (1) E would still be the appropriate answer choice.
What do you guys come up with ?
Kind regards,
Tobi
Here comes the problem:
QDS08429 Official Prep Software pack:
" <-----a------b------->
If a,b and c are three numbers on the number line shown above, is c between a and b?
(1) b < 0
(2) a - b > c
Correct answer: E
Official Answer explanation:
Determine if c lies between a and b on the number line.
(1) It is given that b < 0, but nothing is known about a and c; NOT Sufficient.
(2) Given that a - b > c, it is possible that c lies between a and b (for example, a = 0, b = -2, and c = -1) and it is possible that c does not lie between a and b (for example, a = 0, b = -2, and c = 1). NOT Sufficient.
Given both (1) and (2) together, the examples given in (2) above show that both statements together are not NOT sufficient to determine if c lies between a and b."
Thats why I think the answer explanation is seriously flawed:
Statement one: fully agree with.
Statement two: From my point of view, a point b right to a point a on the number line cannot be smaller than that point a. However, since b = -2 is smaller than a = 0 the authors of the test seem to disagree with my standpoint (see the boldfaced portions of the official answer explanation). Do I need enlightenment ?!
Nevertheless, since the reasoning seems fine, I would suggest picking the following values:
Statement 2: c can lie between a and b for the values a = - 4 , b = -2 and c = -3, then a - b = -2 > - 3 and c lies between a and b. On the other hand c can lie outside range a and b for the values a = -2 b = -1 c = -3, then a-b = -1 > - 3 and c does not lie between a and b.
Since both the values introduced in Statement two also satisfy the constraint in (1) E would still be the appropriate answer choice.
What do you guys come up with ?
Kind regards,
Tobi
). 
