IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: 7ooD on May 18, 2009, 07:40:10 pm

Title: can someone answer this maths question in paper 4
Post by: 7ooD on May 18, 2009, 07:40:10 pm
how can it be that Nth+ (n+1)th term = (n+!)^2?????
Title: Re: can someone answer this maths question in paper 4
Post by: Ghost Of Highbury on May 18, 2009, 07:46:01 pm
for which sequence,
plz write down the sequence
Title: Re: can someone answer this maths question in paper 4
Post by: 7ooD on May 18, 2009, 07:51:45 pm
oh dam i found the answer i did it wrong the correct answer is

n(n+1)   +  (n+1)(n+2)
 
               
  k(2)         K(2)

n square+n   + n square+3n+2
 
                       
         2                          2

2n square+4n+2
     
       2

n square + 2n + 1

= (n+1)(n+1)
=(n+1) square
Title: Re: can someone answer this maths question in paper 4
Post by: Ghost Of Highbury on May 18, 2009, 07:54:24 pm
well i didn't understand a word...don't know from which paper too... ;)
but happy that u got the right answer :)
Title: Re: can someone answer this maths question in paper 4
Post by: 7ooD on May 18, 2009, 07:55:04 pm
dude it is maths paper 4 2009 june this session paper
Title: Re: can someone answer this maths question in paper 4
Post by: Ghost Of Highbury on May 18, 2009, 07:57:07 pm
well!!
i am appearing for the nov 2009 exam..
not this one
(1 year younger to u guys)
lol
 :)
Title: Re: can someone answer this maths question in paper 4
Post by: sandydandy on May 19, 2009, 06:35:37 am
gosh, that question!!! so bad!! i lost all 5 marks... read the question like 24 million times but still didn't answer....... cancelled like 5 billion times.... that question really put me down... i don't even want to no the answer.... :'(
Title: Re: can someone answer this maths question in paper 4
Post by: unknown on May 19, 2009, 06:38:54 am
hey even i cldnt get it bt then finally i did wth d subsitution method to prove tht it was (n+1)^2 n ya i gues i can achieve marks by tht method 2 n dam i m worried fr probabaility i messed it up n ya wht is d % ans of tht sphere..... ???
Title: Re: can someone answer this maths question in paper 4
Post by: Name on May 19, 2009, 07:04:25 am
Quote from: unknown on May 19, 2009, 06:38:54 am
hey even i cldnt get it bt then finally i did wth d subsitution method to prove tht it was (n+1)^2 n ya i gues i can achieve marks by tht method 2 n dam i m worried fr probabaility i messed it up n ya wht is d % ans of tht sphere..... ???

i thought there was some mistake in the "show clearly that the sum is (n+1) squared :S
and for the precentage of the sphere, i got 502%!!!
Title: Re: can someone answer this maths question in paper 4
Post by: unknown on May 19, 2009, 07:08:33 am
ok do u knw d probabillity ans plzzzz
Title: Re: can someone answer this maths question in paper 4
Post by: thukon on May 19, 2009, 08:45:16 am
Quote from: Name on May 19, 2009, 07:04:25 am
Quote from: unknown on May 19, 2009, 06:38:54 am
hey even i cldnt get it bt then finally i did wth d subsitution method to prove tht it was (n+1)^2 n ya i gues i can achieve marks by tht method 2 n dam i m worried fr probabaility i messed it up n ya wht is d % ans of tht sphere..... ???

i thought there was some mistake in the "show clearly that the sum is (n+1) squared :S
and for the precentage of the sphere, i got 502%!!!
For the percentage of the sphere i got 4 hundred something. And the nth term is easy. You have to prove that the nth TERM plus the nth+1 TERM = n(NOT TERM)^2. So the 2nd term was 3 and the 3rd term was 6 so   3+6=(2+1)^2