could any1 help me?? ^_^

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A) prove that the sum of the first n terms in an arithmetic series is              s = n/2 [2a+(n-1)d] where a =  first term and d = common difference

B) use this to find the sum of the first 100 natural numbers

thanx people ^_^

Posted Thu 8th November, 2012 @ 19:03 by Waqar Khanny :)
Edited by Waqar Khanny :) on Thu 8th November, 2012 @ 19:04

37 Answers

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Im sorry khann! Dont wna help you :P 

Answered Fri 9th November, 2012 @ 21:17 by adfv
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:( ur mean zainab

Answered Sat 10th November, 2012 @ 18:15 by Waqar Khanny :)
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Aww! Im not :) LOL

Answered Sat 10th November, 2012 @ 18:18 by adfv
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I Jus dont knw the answer :) Hhahhaa

Answered Sat 10th November, 2012 @ 18:19 by adfv
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Im sorry :(

I Know ull forgive me because ur amazing <3 **

Answered Sat 10th November, 2012 @ 19:37 by adfv
Edited by adfv on Sat 10th November, 2012 @ 21:21
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lol XDD am i??? ;P itz kay i forgive u XDDD

Answered Sun 11th November, 2012 @ 16:38 by Waqar Khanny :)
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Yeppp :D Thankyou :D 

Answered Sun 11th November, 2012 @ 16:38 by adfv
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lol thnx XD no probz babe ;D

Answered Sun 11th November, 2012 @ 16:43 by Waqar Khanny :)
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:D Makin me happy :))LOL

Answered Sun 11th November, 2012 @ 16:45 by adfv
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and mental at the same time:P

Answered Sun 11th November, 2012 @ 16:45 by adfv
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lool i can hav dat affect on some people ^_^

Answered Sun 11th November, 2012 @ 20:29 by Waqar Khanny :)
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Ohh really? hhaha :P i dint knw that!! 

Answered Sun 11th November, 2012 @ 20:30 by adfv
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LOL XDDD haha welll u knw now ;P

Answered Sun 11th November, 2012 @ 20:34 by Waqar Khanny :)
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yehh now i know very well :D ;)

Answered Sun 11th November, 2012 @ 20:34 by adfv
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LOL ^_~

Answered Sun 11th November, 2012 @ 21:03 by Waqar Khanny :)
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Love you khan <3
And the burns still there!! :) see i dnt knw wether i shud be happy or sad, but ima go wiv happy cuz then i remembr u wen i see it :P

Answered Sun 18th November, 2012 @ 22:27 by adfv
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awww babe i luv u 2 XDD

damn my fault..sos :(  awww lol XDD

Answered Mon 19th November, 2012 @ 19:01 by Waqar Khanny :)
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:D :D

Nope its all gooddd :D 

Answered Mon 19th November, 2012 @ 19:06 by adfv
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u sure...i can cum nd make it betta 4 u ^_^

Answered Mon 19th November, 2012 @ 19:11 by Waqar Khanny :)
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Hhaaahha:) how?? :D come then ;) LOOOL

Answered Mon 19th November, 2012 @ 19:11 by adfv
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hmm..ud be suprised XDDD dw am cumin ;P

Answered Mon 19th November, 2012 @ 19:15 by Waqar Khanny :)
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Loooooool!! Hmmm surprises ;) haahhaa :P yayyyyyyyy :D
Love youuuu sooooooooooooooooooooooooooo much sachiii!!

Answered Mon 19th November, 2012 @ 19:17 by adfv
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yeah suprises..nd mine are da best sooo ud enjoy XD

really? awwwwww mein bhii jaanu XDD

Answered Mon 19th November, 2012 @ 19:36 by Waqar Khanny :)
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LOOOOL! are theyyy ? :P 

AWWWWWWWWWWWWWWWWWWWWWWWWw!! <3

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Answered Mon 19th November, 2012 @ 19:45 by adfv
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hhaha yeah dey r XDD hmmm need 2 cum ova soon dont i XDD id lyk 2 put those kisses somewhere XDDD

Answered Mon 19th November, 2012 @ 19:49 by Waqar Khanny :)
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Hhahaha! somewheeeere! ooooooooooooooohhh LOL 

Answered Mon 19th November, 2012 @ 19:50 by adfv
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hmmm yeah some where babe...lool XDDD

Answered Mon 19th November, 2012 @ 19:56 by Waqar Khanny :)
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ahahha! an where is that some where? LOOOOL

Answered Mon 19th November, 2012 @ 20:04 by adfv
Edited by adfv on Mon 19th November, 2012 @ 21:55
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looool XDD haha ull find out dw.... jus keep waitin innih XDDD

Answered Mon 19th November, 2012 @ 20:24 by Waqar Khanny :)
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Hahahhaha! keep waitin! hmm okayy :P (have i ever told you) I LOVE YOU lol! 

Answered Mon 19th November, 2012 @ 21:38 by adfv
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the sum of the numbers = the number of terms (n) divided by 2 ( 2xthe first number + (n-1)x the difference between each number)

we know the difference = secound term (2) subtracted by the first term (1)

so the difference =1

the formula now looks like this

Sn= 100/2 (2x1+99x1)

So Sn= 50x101

So finnaly the sum of the first 100 natural numbers= 5050

If its unclear how i got that just reply and ill try to explain it better :p

Hope this helps

RTF

Answered Tue 20th November, 2012 @ 09:35 by Ragnaros the Firelord
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ermmm yahh kinda iz..soz ragnoras the firelord ((haha)) i got lost :((

Answered Tue 20th November, 2012 @ 16:19 by Waqar Khanny :)
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lool zainab keep waitin...haha nd yeah u may have mentioned it XDDD rememba ily 2 :P

Answered Tue 20th November, 2012 @ 16:19 by Waqar Khanny :)
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awwwwwwwwwwwwwwwwwwwwww :D 

Answered Tue 20th November, 2012 @ 16:33 by adfv
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:P :P lool XDD

Answered Tue 20th November, 2012 @ 16:38 by Waqar Khanny :)
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;) :P :P :) :D 

Answered Tue 20th November, 2012 @ 16:39 by adfv
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np xD

Answered Tue 20th November, 2012 @ 16:47 by Ragnaros the Firelord