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General Discussion
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Please tell Books for exhaustive practice for the sections
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MathRevolution , can you please explain the solution of the below question.

When both positive integers a and b are divided by 7, both have a remainder of 4. What is the remainder when ab3 is divided by 7?
A. 6
B. 5
C. 4
D. 3
E. 2

Can we assume that a and b and single digit integers, since abc3 is a three-digit integer?
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is it possible to get an explanation of the solutions for #1, 2, 3, 6, 9, 11, 12, 13?
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oishik2910! We currently have our own book for internal teaching purpose for our own members but we are planning to publish the 3 books through Amazon by the end of Feb. Or, if you are interested in free videos and free core theory, you may join the membership in our site.
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nycgirl212! As this section is for general GMAT strategies and questions, if you want to know how to solve these questions, you may post the questions in Math Forum then we can post reply.
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hi chetan2u, thanks a lot for the explanation. I also followed similar approach and got 6 as my answer, but the post above has mentioned option C (i.e. 4) as the right answer.
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This question is frequently on GMAT Math lately, which is 2 by 2 question.
Attachment:
GCDS overview of GMAT에 대한 댓글답변 (20160118).jpg
GCDS overview of GMAT에 대한 댓글답변 (20160118).jpg [ 33.78 KiB | Viewed 209990 times ]

On the above, suppose all the passengers 100p(if there is %, use 100 since it is per cent. p is an initial for passengers). Passengers who brought a round ticket and a laptop is 40% of the total passengers, which is 40p. However, what 20% means is that x=10 is derived from 40p:xp=80%:20%=4:1. That is, 40p+10p=50p, which means 50% of the passengers have round tickets. Therefore, the answer is C.
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If you are serious about hitting 49-51, you may find this post useful (Ultimate Guide Q51)
the-ultimate-q51-guide-209801.html#p1641408
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The understandable explanation. It is really helps to me
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Questions related to geometry are continuously increasing. Let’s have a look at the example of the recent trend.

(ex 4)
Attachment:
GEOMETRY.jpg
GEOMETRY.jpg [ 2.98 KiB | Viewed 206281 times ]
If n regular pentagons are tangent each other in points of a circle as above figure, n=?

A. 8
B. 9
C. 10
D. 11
E. 12
Answer: C

Questions like the above are increasing. Therefore, students preparing for GMAT should focus on geometry more intensively.
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Furthermore, not only simple but also analysing questions are also frequently given. Let's have a look at the question below.
(ex 5)

There is Fi.
A) If i is an even number, the inner figure is a horizontal rectangle. If i is an odd number, the inner figure is a vertical rectangle.
B) If remainders are 2,1,0, dividing i with 3, each outer figure is circle, triangle, and rectangle.
C) If i is an even number and an inbetween area of 2 figures is an odd number, it is an area of an inner figure.
Which one is possible for the figure of F32?

Attachment:
FIGURE.jpg
FIGURE.jpg [ 8.17 KiB | Viewed 205462 times ]
Answer: A
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Moreover, the mistake type 3 and 4 are substantially increasing. Let's have a look at a recent question.

(ex 6) If a and b are positive integers, what is the greatest common factor of a and b?
1) a=b+1
2) a=26

In this case, C is an answer though you should apply the mistake type 4(A) as it is an integer question, which is one of the key questions. For 1), GCD(a,b)=1. That is, it is always 1, which is unique and sufficient.
Therefore, the answer is A.

For these reasons, with increase of geometry and the mistake 3 and 4 questions, you should study in an organised and logical way.
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In addition, for highly advanced integer questions are on the similar level of the question below.

(ex 6) If m is a positive integer, is √13m an integer?
1) 117m is the square of an integer.
2) m/117 is the square of an integer.
Answer: D

In this case, the answer is D since there is 1 variable. If you actually encounter a question like this, you might be confused. The advanced level of integer questions like this are frequently given.
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Also, geometry questions are rising continuously. Let's take the recent question as an example.

(ex 4)
Attachment:
yin yang.jpg
yin yang.jpg [ 4.6 KiB | Viewed 204320 times ]

There is a yin-yang symbol shown as above figure such that its radius is 2. What is the area of the region shaded?
1) Both arc MNO and arc OCD are the same semi-circles.
2) The area of region shaded is half of the area of the circle

Answer: B

In this case, 1) and 2) are the same, which makes D the answer. Just like the question above, slightly difficult and deriving 1)=2) questions which make D the answer are frequently given as well. This type of geometry questions are steadily on an upward tendency.
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Hello Math Revolution Team,

Could you please use spoilers to reveal the answers to your questions ?

Many Thanks !

Posted from my mobile device
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Plus, inequality questions disregarding square frequently appear as well. Let’s have a look at the question below.

(ex 5) If xy2z3<0, is xyz>0?
1) y<0
2) x<0

Answer: A

In this case, if you disregard square in the original condition, ‘If xz<0’ is derived and ‘is xyz>0’ becomes ‘is y<0?’, which makes A the answer.
This type of question is frequently given.
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Also, the highly advanced hidden integer questions frequently appear on exams.

(ex 6) Tom, who has 50 math questions, will get 5 points per question if he chooses a correct answer. If he chooses a wrong answer to a question or skips one, he will lose 2 points per question. Then, which of the following can be the score if he solves all the 50 questions?

A. 192
B. 193
C. 194
D. 195
E. 196


Answer: C
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