GMAT:Punch Of the Week (22-July-09)

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GMAT:Punch Of the Week (22-July-09)

Author: Sureshbala

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What is "Punch Of The Week"?

Every week Learnhub's team will post one question each on Verbal Ability and Quantitative Ability of the GMAT Test Preparation
Members can post their answers along with explanations for the next one week.
After one week, Learnhub's team will post the official answer along with the explanation.Besides answering the previous week's questions, Learnhub's Team will come up with the next set of questions for that week as well.

What are the rules of "Punch Of The Week"?

	Every user must refrain from posting sarcastic comments on the answers posted by others.
	Once the Learnhub's team posts the official answer along with the explanation, no comments must be made regarding those questions. In case of further clarification please send a personal message to the respective team member
	If you think that there is something wrong with the explanation of the Learnhub's Team, which seldom happens, please send a personal message to the respective team member informing him/her the same. Posting the same here will not be considered and will be deleted.
	Please bear in mind that only Learnhub's Team members have the privilege of posting questions here. Questions posted by other members will not be entertained and hence will be deleted immediately.

"Punch Of The Week" Team Members

This Week's Punches

Sentence Correction

Many travelers state unequivocally that the streets in Paris are more beautiful than any other city.

(A) that the streets in Paris are more beautiful than any other city.
(B) that the streets in Paris are more beautiful than those in any other city.
(C) that Parisian streets are more beautiful than in any other city.
(D) that, unlike any other city, Parisian streets are more beautiful.
(E) that the streets of Paris are more beautiful than the streets in any other city.

Problem Solving

What is the remainder when $2^{68}$ is divided by

?

A. 4
B. 16
C. 12
D. 20
E. 2

Click here for last week's Punch and explanatory answers for the same

Posted on 29-July-09

So,folks here are the correct answers

Sentence Correction
The correct answer is B.

(A) creates ambiguity through faulty parallelism: Are streets being compared with streets or with cities? (E) eliminates confusion by using strict parallel structure: "the streets in Paris" is balanced by "the streets in any other city." But (B) is better because it saves a word by using "those" instead of repeating "the streets." ( C) and (D) only worsen the parallelism.

Problem Solving
The correct answer is A.

$\text{ We need the remainder when} 2^{68} \text{ is divided by 21}$

$\text{We have }2^{68} = (2^6)^{11} \times 2^2$

$\Rightarrow 2^{68} = (64)^{11} \times 4$

$\text{Now 64 leaves a remainder 1 when divided by 21.}$

$\Rightarrow (64)^{11} \text{ leaves a remainder 1 when divided by 21}$

$\Rightarrow (64)^{11} \times 4 \text{ leaves a remainder 4 when divided by 21.}$

Hence, option A

Click here for the next week's Punch

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18 Comments

ratanat21 said – Wed, 22 Jul 2009 16:48:19 -0000 ( Flag Edit Link )

E for sentence correction E for quant question
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Pranky said – Wed, 22 Jul 2009 17:56:39 -0000 ( Flag Edit Link )

B for SC n E for Quant
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chetan2u said – Thu, 23 Jul 2009 09:49:04 -0000 ( Flag Edit Link )

ans- sc-’B’...... parallelism :streets in paris should llel to streets in any other city…......................ps-’A’..... look for pattern… 2^{5 leaves a remainder of 11,( 2}6:1)...(2^7:2)...(28:4)....(2^9:8)...(210:16)....(2^{11:11)...pattern follows six nos-11,1,2,4,8,16…...therefore 2}68 will lve a remainder of 4 because 68=8+60
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rishitalwar said – Thu, 23 Jul 2009 17:15:27 -0000 ( Flag Edit Link )

i agree with chetan
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uditaghosh said – Sat, 25 Jul 2009 06:35:58 -0000 ( Flag Edit Link )

sentence corrrecn=e nd q=4
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srisri145 said – Sat, 25 Jul 2009 14:29:12 -0000 ( Flag Edit Link )

sentence correction: e
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srisri145 said – Sat, 25 Jul 2009 16:27:08 -0000 ( Flag Edit Link )

sentence correction: e
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amitcat said – Sun, 26 Jul 2009 10:47:26 -0000 ( Flag Edit Link )

SENTECE CORR ANS. IS ‘E’
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AmoghGarg said – Sun, 26 Jul 2009 10:48:09 -0000 ( Flag Edit Link )

SC-b, PS-a
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s_sravan said – Sun, 26 Jul 2009 16:16:38 -0000 ( Flag Edit Link )

SC:-B
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apigud said – Mon, 27 Jul 2009 07:39:44 -0000 ( Flag Edit Link )

sc- A
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sm art said – Mon, 27 Jul 2009 14:32:23 -0000 ( Flag Edit Link )

1) e 2) a
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ravi8319 said – Mon, 27 Jul 2009 21:19:08 -0000 ( Flag Edit Link )

For SC it is B … PS
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Dhiviyaa said – Tue, 28 Jul 2009 10:52:22 -0000 ( Flag Edit Link )

For SC – B PS – B
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jhkamp said – Wed, 29 Jul 2009 00:03:06 -0000 ( Flag Edit Link )

Great service. Will post and share. Thanks!

www.collegeandgraduatetestprep.com
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getsho said – Wed, 29 Jul 2009 04:15:24 -0000 ( Flag Edit Link )

For SC -Its B. Streets in paris should be compared to streets in any other city. B Corrects this parallelism error and hence B.

For PS- Its A. 2^{1/21=2
2}2/21=4 2^{3/21=8
2}4/21=16 2^{5/21=11
2}6/21=1 2^{7/21=2
From above we see that pattern repeats after 2}6. Hence 2^68/21=22/21=4. Hence A
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1. ruchi garg said – Wed, 05 Aug 2009 16:59:42 -0000 ( Flag Edit Link )
  
  Hi good explanation to PS but still cudnt understand how 68 2 /21=2
  
  pls explain.i m new here.
  
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2. Sureshbala said – Mon, 10 Aug 2009 01:29:02 -0000 ( Flag Edit Link )
  
  Hi, please go through the solution posted above and that would be easy to follow.
  
  Regards
  
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Ankz24 said – Wed, 29 Jul 2009 07:03:31 -0000 ( Flag Edit Link )

1) B and 2) A
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lalitdowlani said – Mon, 17 Aug 2009 13:10:23 -0000 ( Flag Edit Link )

Answer for SC is B
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