Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 27 May 2017, 15:36

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

What is the sum of the square of the first n positive

Author Message
Manager
Joined: 11 Jan 2005
Posts: 101
Followers: 1

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

What is the sum of the square of the first n positive [#permalink]

Show Tags

26 Jan 2005, 23:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the sum of the square of the first n positive integer if the sum of the square of the first n even positive integer is A

1. 3A/4
2. A/2
3. A/3
4. A/4
5. A/8
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

Show Tags

26 Jan 2005, 23:17
A=2^2+4^2+6^2+...=2^2*1^2+2^2*2^2+2^2*3^2+...=2^2(1^2+2^2+3^2+...)=4S

S=A/4
VP
Joined: 25 Nov 2004
Posts: 1486
Followers: 7

Kudos [?]: 104 [0], given: 0

Show Tags

27 Jan 2005, 00:07
praveen_rao7 wrote:
shouldn't the answer be > A?

Nope.............

suppose n = 4

sum of sq of first n +ve even integers(A)= 2^2+4^2+6^2+8^2=120
sumof sq of first n +ve integers (a) =1^2+2^2+3^4^2 = 30
A/a=120/30
a=A/4
Manager
Joined: 28 Jan 2005
Posts: 98
Followers: 1

Kudos [?]: 1 [0], given: 0

Show Tags

31 Jan 2005, 04:57
Great explanation. Just need to get used to the symbols here which tend to make things a little more confusing. Once I re-wrote using normal notation it made much more sense.
31 Jan 2005, 04:57
Display posts from previous: Sort by