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

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Manager
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Re: Basic Mathematical Principles: [#permalink] New post 11 Jan 2011, 12:52
thanks man. very helpful. great stuff. :)
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Re: Basic Mathematical Principles: [#permalink] New post 13 Apr 2011, 02:53
thanks.. this is a really useful thread..!
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Re: Basic Mathematical Principles: [#permalink] New post 18 Apr 2011, 09:56
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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Re: Basic Mathematical Principles: [#permalink] New post 19 Jan 2012, 20:00
thanks for posting
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Re: Basic Mathematical Principles: [#permalink] New post 19 Jan 2012, 20:07
thanks for posting this download
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Re: Basic Mathematical Principles: [#permalink] New post 11 Feb 2012, 16:50
Thank you for this!
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Re: I'm going to make a sticky thread where the very very basic [#permalink] New post 12 Oct 2012, 06:16
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] New post 25 Jan 2014, 14:22
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Re: I'm going to make a sticky thread where the very very basic [#permalink] New post 05 Feb 2014, 06:19
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] 05 Feb 2014, 06:19
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