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# solidcolor's mezzanine

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Manager
Joined: 25 May 2007
Posts: 229

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solidcolor's mezzanine [#permalink]

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18 Sep 2007, 08:13
I'm going to retake GMAT in October. Guys, allow me to create a personal topic here, I'm just trying to motivate myself with this re-taking process.

I took GMAT last Monday. Got 650 (Q46 V34). That was very upset coz' I'm aiming for 700+.

I knew I performed so bad in the test, ran out of time in Quant (I normally didn't in my practice, I normally scored 48-50 in GMATPrep and 46 in MGMAT).

For Verbal, it's kinda hard to understand, I felt comfortable with all the questions, I didn't feel any thing particularly challenging. But I scored so low, V34. At home I often scored 37-40... I want to bring my Verbal to 40+ and hold Quant at 50 if not 51...

So I've been studying all over again. And this topic is to keep track of my studying.

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18 Sep 2007, 08:32
GMATPrep Q50. 10 incorrect.

Tonight I do Quant only. My timing is good: no waste, no rush.

The first question was scary. But I got it right. .

Got Q7-8-9-10 incorrect, in a row! Then 14, 20, 22, 29, 32, 36. Some for carelessness (2 careless errors out of 10, the other 8 are challenging to me).

Quote:
29. What is the result when x is rounded to the nearest hundredth?

(1) When x is rounded to the nearest thousandth the result is 0.455

(2) The thousandths digit of x is 5

Quote:
32. If set S consists of the numbers 1, 5, -2, 8, and n, is 0<n<7?

(1) The median of the numbers in S is less than 5

(2) The median of the numbers in S is greater than 1

Quote:
22. On the line number, the segment from 0 to 1 has been divided into fifths (indicated by the large tick marks), and also into sevenths (indicated by the small tick marks). What is the LEAST possible distance between any two of the tick marks?

A. 1/70
B. 1/35
C. 2/35
D. 1/12
E. 1/7

Quote:
20. In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) The least common denominator of x/y and 1/3 is 6

(2) x = 1

Quote:
14. If two of the four expression x+y, x+5y, x-y and 5x-y are chosen at random, what is the probability that their product will be of the form x^2 - (by)^2, where b is an integer?

A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/6

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Manager
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18 Sep 2007, 08:43
Quote:
7. A certain jar contains only b black marbles, w white marbles, and r red marbles. If one marble is to be chosen at random from the jar, is the probability that the marble chosen will be red greater than the probability that the marble chosen will be white?

(1) r/(b+w) > w/(b+r)

(2) b-w > r

Quote:
8. If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value if r?

(1) 2 is not a factor of n

(2) 3 is not a factor of n

Quote:
10.

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18 Sep 2007, 09:34
SC1000 - 301-320: 17/20 (85%)

Incorrect: 304, 307, 309.

Quote:
304. For many people, household labor remains demanding even if able to afford household appliances their grandparents would find a miracle.
(A) even if able to afford household appliances their grandparents would find a miracle
(B) despite being able to afford household appliances their grandparents would find a miracle
(C) even if they can afford household appliances their grandparents would have found miraculous
(D) although they could afford household appliances their grandparents would find miraculous
(E) even if they are able to afford household appliances which would have been a miracle to their grandparents

Quote:
307. For most consumers, the price of automobile insurance continues to rise annually, even if free of damage claims and moving violations.
(A) even if
(B) despite being
(C) even if they are
(D) although they may be
(E) even if remaining

Quote:
309. For some birds the sense of smell appears to play a role in navigation, since pigeons with surgically removed olfactory nerves were found to have increased difficulties in homing.
(A) were found to have increased difficulties
(B) have been found to have increased difficulty
(C) were found to have increasing difficulty
(D) had been found to have increased difficulties
(E) have been found to have increasing difficulties

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19 Sep 2007, 04:29
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32)

The numbers we have are: -2, 1, 5, 8 and n. If n is less than or equal to 1, the median is always 1. But, for n>2, the median is n (for example for n=2, median is 2, for n=3, median=3) but for n>=5, median is always 5.

According to (1), median is less than 5. In order for this to happen, n must be greater than 2 and less than 5. That lies within (0,7) and therefore, this statement is sufficient.

According to (2), median>1. For this to happen, n should be greater than 2 as we said before. But, if n=10, then the median is 5 again. Therefore, we do not know if n lies in (0,7) and therefore, this statement is insufficient.

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19 Sep 2007, 04:37
22)

Large ticks: 1/5, 2/5, 3/5, 4/5, 5/5, or 7/35, 14/35, 21/35, 28/35, 35/35

Small ticks: 1/7, 2/7, 3/7, 4/7, 5/7, 6/7, 7/7 or:
5/35, 10/35, 15/35, 20/35, 25/35, 30/35, 35/35.

The smallest distance is (21/35)-(20/35) = 1/35.

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19 Sep 2007, 04:43
14)

From the 4 given expressions, only two of them give a product in the x^2 - b^2y^2 fashion: x+y and x-y with product x^2 - y^2 (b=1). All the other expressions, if multiplied, will result in the appearence of the xy factor.

Therefore, the probability is 2/4 = 1/2

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19 Sep 2007, 05:21
The total number of marbles is b+r+w. The probability that red marbles are chosen is P1 = (b+r+w r) Excuse me for the notation but I do not know how else to write it..

The probability that white marbles are chosen is P2 = (b+r+w w). We must compare P1 to P2:

P1 = (b+r+w)! / r!(b+w)! (1)

P2 = (b+r+w)! / w!(b+r)! (2)

P1 / P2 = w!(b+r)! / r!(b+w)! (3)

Since w r and b are positive integers, w! < (w+b)! (4)

Therefore, (3) becomes:

P1 / P2 = w!(b+r)! / r!(b+w)! < (w+b)!(b+r)! / r!(b+w)!, or

P1 / P2 < (b+r)! / r! and hence P1 < P2.

It seems to me that the statement itself is sufficient.

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19 Sep 2007, 05:41
If n is not a factor of 2, then it can be for example 3 or 7 or 11:

For n=2, r=3
For n=7, r=0
For n=9, (9^2-1^2) / 24 gives r = 1 (80/24 = 10/3).
Therefore, we cannot determine r with the first assumption.

If n is not a factor of 3, let it be 2 or 4 or 8:

For n = 2, r=3
For n = 4, r=15
For n=8, r=5 (63/24=21/8)

We cannot determine r here either.

Therefore, no statement is sufficient.

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Manager
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29 Sep 2007, 21:22
I'm back. It's time for CR.

29 Sept: CR1000, Test III: 12/20 (not taking time into account)
30 Sept: CR1000, Test II: 16/20 (not taking time into account)

I'll try to bring it up...

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29 Sep 2007, 21:40
SC1000 (did long time ago):

Q310- Q384: 15 incorrect, hit rate 80%.
Q385- Q410: 9 incorrect, hit rate 58%.

Man it fluctuates like hell. I'll give a better try today.

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30 Sep 2007, 09:42
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solidcolor wrote:
SC1000 (did long time ago):

Q310- Q384: 15 incorrect, hit rate 80%.
Q385- Q410: 9 incorrect, hit rate 58%.

Man it fluctuates like hell. I'll give a better try today.

Are you going over your errors and learning lessons from them? Your hit rates fluctuate so much that it seems like it really just depends on the difficulty of the question.

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30 Sep 2007, 10:28
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You make a good point. It depends more on my health conditions, physical and mental, on the weak knowledge ground...

I learned some from the errors anyway. But I forgot quite a lot...

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30 Sep 2007, 15:28
solidcolor wrote:
You make a good point. It depends more on my health conditions, physical and mental, on the weak knowledge ground...

I learned some from the errors anyway. But I forgot quite a lot...

Yeah, IMO if your hit rate is fluctuating that drastically given those factors, it's a good sign that you're fundamentals are quite as strong as they should be. Have you gone through MGMAT's SC book?

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01 Oct 2007, 06:18
Yes I did, I revise it quite many times. The hardest thing to remember is IDIOMS. The hardest rules are COMPARISONS.

I need to be more stable.

Thanks for your encouraging words.

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01 Oct 2007, 11:35
solidcolor wrote:
Yes I did, I revise it quite many times. The hardest thing to remember is IDIOMS. The hardest rules are COMPARISONS.

I need to be more stable.

Thanks for your encouraging words.

Just stick with it and you'll do fine. Think about creating an error list of SC's that you've missed and compare them for common mistakes and look for common "clues" that will help you see the error next time around.

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07 Oct 2007, 06:54
It's really hard to study at night after a full day working hard... I feel better to study at weekend.

mayonnai5e, this is my hit rate for CR (I feel I am weak in CR, as my logic mind is so poor):

CR1000:

Test 2: 16/20
Test 3: 17/20
Test 4: 18/20
Test 5: 17/20
Test 6: 17/20
Test 7: 18/20
Test 8: 20/20

A number of of questions are repeated from OG. Some of them I felt the same difficulty and got incorrect answers again...

Anyway I am glad that I'm getting better in CR, feeling more confident in reasoning for the right answers.

I think the most important thing is your confidence in countering the questions. When you feel you are confident, and in deed feel comfortable in drawing answers, you master it.

More practice and more practice. This is the second time I study for GMAT but I never get fed up.

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07 Oct 2007, 07:12
Fun for a while, how many times did I repeat the word or refer to "the feeling" in the previous post? No wonder why I am poor in logic. (Assumption: Feelings are illogical).

Studying GMAT is fun but not easy. All types of disturbance may occur and seriously affect the study.

Anyway anyway...

Last edited by solidcolor on 12 Oct 2007, 22:07, edited 1 time in total.

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12 Oct 2007, 22:06
SC1000, Q411-Q536 (125 questions): 25 incorrect.

Hit rate: 80%.

I've gotta bring this up. 90%, is it possible? Last week I wasn't concentrated.

I'm gonna make a collection of wrong-answered questions out of this SC1000 set, and try them again. I've gone half the set.

Still in love with GMAT. It's fun.

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23 Oct 2007, 09:18
Q700-799: 16 incorrect. Hit rate 84%.

Q600-699: 25 incorrect. Hit rate 75%.

Q500-599: 22 incorrect. Hit rate 78%.

Q400-499: 15 incorrect. Hit rate 85%.

Q300-399: 25 incorrect. Hit rate 75%.

Q200-299: 25 incorrect. Hit rate 75%.

Q100-199: 23 incorrect. Hit rate 77%.

Q1-99: 20 incorrect. Hit rate: 80%.

What can we tell from this?

There are some repeated mistakes. There are many new concepts (idioms, word usages, etc.) There are careless errors.

I'm gonna stop right here and start revising the 800 questions again. I'm getting scared now...

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23 Oct 2007, 09:18

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