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# I'm going to make a sticky thread where the very very basic

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Manager
Joined: 26 Dec 2009
Posts: 132

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Location: United Kingdom
Concentration: Strategy, Technology
GMAT 1: 500 Q45 V16
WE: Consulting (Computer Software)
Re: Basic Mathematical Principles: [#permalink]

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11 Jan 2011, 13:52
thanks man. very helpful. great stuff.

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Intern
Joined: 28 Dec 2010
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Re: Basic Mathematical Principles: [#permalink]

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13 Apr 2011, 03:53
thanks.. this is a really useful thread..!

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Intern
Joined: 10 Jan 2011
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Location: India
Schools: ISB, IIM-A
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Re: Basic Mathematical Principles: [#permalink]

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18 Apr 2011, 10:56
shrive555 wrote:
The sum of N consecutive integers:
S=(n+n+N-1)*N/2=n*N+N*(N-1)/2
S/N=n+(N-1)/2
If N is odd, then S would be a multiple of N. If N is even, then S would not be a multiple of N.

i don't understand this.....

It simply means that if you are adding N consecutive integers then their sum S will be a multiple of N if N=odd

i.e for example

let suppose a series of 1,2,3,4,5
total integers =5 (N=5)

sum of integers=15 (1+2+3+4+5)

then 15 is a multiple of 5 i.e N

this is the only for N= odd not for N= even
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Rahul

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Re: Basic Mathematical Principles: [#permalink]

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19 Jan 2012, 21:00
thanks for posting

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Manager
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Re: Basic Mathematical Principles: [#permalink]

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19 Jan 2012, 21:07

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Manager
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Re: Basic Mathematical Principles: [#permalink]

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11 Feb 2012, 17:50
Thank you for this!

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Re: I'm going to make a sticky thread where the very very basic [#permalink]

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12 Oct 2012, 07:16
Nice! I love this thread. I have long forgotten about the basics. ^^

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Re: I'm going to make a sticky thread where the very very basic [#permalink]

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25 Jan 2014, 15:22
Hello from the GMAT Club BumpBot!

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Re: I'm going to make a sticky thread where the very very basic [#permalink]

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05 Feb 2014, 07:19
a=4 , b= 3 , and c=-5 ,d=-9 . then a>c , b>d . then it is not ab >cd . it is not . because 12>45 ? not true .

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Re: I'm going to make a sticky thread where the very very basic [#permalink]

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30 Mar 2015, 08:38
Hello from the GMAT Club BumpBot!

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18 Jun 2016, 20:51
Hello from the GMAT Club BumpBot!

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Re: I'm going to make a sticky thread where the very very basic [#permalink]

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04 Jul 2017, 21:59
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: I'm going to make a sticky thread where the very very basic   [#permalink] 04 Jul 2017, 21:59

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# I'm going to make a sticky thread where the very very basic

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