Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Apr 2015, 13:10

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# 165)^2 - (164)^2 = a. 1 b. 100 c. 229 d. 329

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Senior Manager
Joined: 30 Aug 2003
Posts: 325
Location: dallas , tx
Followers: 1

Kudos [?]: 9 [0], given: 0

165)^2 - (164)^2 = a. 1 b. 100 c. 229 d. 329 [#permalink]  04 Nov 2003, 10:55
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
(165)^2 - (164)^2 =

a. 1
b. 100
c. 229
d. 329
e. 349
any short cut?
_________________

shubhangi

Director
Joined: 28 Oct 2003
Posts: 503
Location: 55405
Followers: 1

Kudos [?]: 10 [0], given: 0

[#permalink]  04 Nov 2003, 11:05
(165*165)-(164*164)=
((165*164)+165)-(164*164)=
((164*164)+165+164)-(164*164)

So as a general rule on these problems (difference of squares of consecutive nonnegative integers), I <i>think </i>the answer will always be the sum of the two terms being squared.
Intern
Joined: 09 Oct 2003
Posts: 24
Location: US
Followers: 0

Kudos [?]: 3 [0], given: 0

[#permalink]  04 Nov 2003, 11:11
?
Senior Manager
Joined: 30 Aug 2003
Posts: 325
Location: dallas , tx
Followers: 1

Kudos [?]: 9 [0], given: 0

[#permalink]  04 Nov 2003, 11:56
What did you do Stoolfi.. ?? its more confusing.. that way..
i guess the best method is to add up both the terms.
165+164??
what do you think?
_________________

shubhangi

Director
Joined: 28 Oct 2003
Posts: 503
Location: 55405
Followers: 1

Kudos [?]: 10 [0], given: 0

[#permalink]  04 Nov 2003, 12:24
subhangi: 165^2 is equal to 165 * 165. It is also equal to (165 * 164)+165.

That's all I did.

I think it makes sense, but it's a wee bit roundabout, maybe...
SVP
Joined: 03 Feb 2003
Posts: 1609
Followers: 6

Kudos [?]: 75 [0], given: 0

[#permalink]  04 Nov 2003, 23:42
165┬▓-164┬▓ = (164+1)┬▓ -164┬▓ =164┬▓ +2*164+1-164┬▓ =2*164+1=328+1=329

OR

165┬▓ -164┬▓ =(165+164)(165-164)=329
[#permalink] 04 Nov 2003, 23:42
Similar topics Replies Last post
Similar
Topics:
6 (165)^2 - (164)^2 = 10 10 Mar 2012, 22:53
D C C D A B 2 08 Jun 2011, 16:24
c^d=(1/c)^(3d-8) what is the value of c^d? a) c=4 b) d= 2 05 Aug 2006, 19:21
If a + b= 200 and a < b, is a + b > c + d? (1) c + d 4 24 Nov 2005, 21:28
How many zeros contained in 100!? (a) 100 (b) 24 (c) 97 (d) 3 12 Nov 2005, 00:18
Display posts from previous: Sort by

# 165)^2 - (164)^2 = a. 1 b. 100 c. 229 d. 329

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.