Mathematics: Post your doubts here!

[MustafaMotani]

daredevil
S1 = 9
when n=1 xD

 

[syed1995]

Maths is quite easy.. but our brains make simple questions so difficult :\

 

[daredevil]

You're freaking out

Yea that's the answers i got.. I just shifted the 2 of n/2 to the other side to make it easier to work with

i got

d=2
16=2a-d
16=2a-2
2a=18
a=9

Answer

i still don't get it... how did u get S1=9 ?? :'( sorry for the big time bother but this question is beating the hell out of me -___-

 

[daredevil]

Maths is quite easy.. but our brains make simple questions so difficult :\

ikr!! :O its like our megaminds are reall evil megaminds!! :O

 

[MustafaMotani]

daredevil just insert n= 1 in that Sn equation

 

[iKhaled]

i still don't get it... how did u get S1=9 ?? :'( sorry for the big time bother but this question is beating the hell out of me -___-

ok i only remember the first part of this question because this is a tricky question so i can't get it out of my mind till this day see

u have the total sum of all the terms formula given..if u substitute 1 in that formula it means u r finding the total sum of 1 term which is 9 so thats our first term got me ?

 

[daredevil]

Ok wow that was really a slap-in-face kind of simple!! :O x_x
thankuu so much iKhaled and MustafaMotani
i seriously don't know how these cie people do this!! they just get into ur heads and play mind games with u given just over an hour with them and them not even being present!! :O >__< urgghh

 

[iKhaled]

Ok wow that was really a slap-in-face kind of simple!! :O x_x
thankuu so much iKhaled and MustafaMotani
i seriously don't know how these cie people do this!! they just get into ur heads and play mind games with u given just over an hour with them and them not even being present!! :O >__< urgghh

CIE examiners r really experts because they know how even if u solved allll the past papers in the world for a subject, the one which u will do in the exam will be different to all of what u did and will be able to trick u!

 

[MustafaMotani]

daredevil .. lemme give yu a hint..
whenevr u get a tough question whch u think is out of syllabus... be sure that that question is the simplest one of all the questions in the paper

 

[syed1995]

MustafaMotani

"co (condone 27 or 1.5)"

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_ms_12.pdf

In 7 part b.. does that mean if one wrote 27 and 1.5 he'd get the mark .. or just 27 is the possible answer?

Since the way I solved it in the end I got both of them as the answer.

 

[syed1995]

i still don't get it... how did u get S1=9 ?? :'( sorry for the big time bother but this question is beating the hell out of me -___-

Sn = n^2 + 8n
S(1) = (1)^2 + 8(1)
S1= 9

That way

 

[syed1995]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_12.pdf

Question 7 part b..

I mean I solved it but didn't really get the concept behind it..

Can someone solve that question for me?

 

[Nibz]

I'd really appreciate if someone can direct me to some vectors notes that cover all or most of the A'level p3 sy. I need them for someone else.

I hope I'm not late.

Here: http://www.mediafire.com/?6hwfccjmuht9cah

 

[Alice123]

I hope I'm not late.

Here: http://www.mediafire.com/?6hwfccjmuht9cah

i'm not a member there, so can u please upload it in pdf form? Sorry for the inconvenience

 

[Nibz]

i'm not a member there, so can u please upload it in pdf form? Sorry for the inconvenience

Of course. =)

 

[iKhaled]

I hope I'm not late.

Here: http://www.mediafire.com/?6hwfccjmuht9cah

thanksss i needed them too! if u have some complex number notes then pls do send them too

 

[Alice123]

Of course. =)

Of course. =)

Thanks

 

[Rutzaba]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s12_qp_12.pdf

Question 7 part b..

I mean I solved it but didn't really get the concept behind it..

Can someone solve that question for me?

see in gp
the formula of term t s given by ar^(n-1)
first term=a
2nd term n2= ar^(2-1)= ar
3rd term n3= ar^(3-1)= ar^2

the second term is nine less than the frst
a- ar=9.....i
the second term and thrd term add up to give 30
ar+ ar^2 =30
solve simultaneously

 

[daredevil]

daredevil .. lemme give yu a hint..
whenevr u get a tough question whch u think is out of syllabus... be sure that that question is the simplest one of all the questions in the paper

ooh thanks Mustafa! that actually was a TIP and a good one at that

 

[syed1995]

see in gp
the formula of term t s given by ar^(n-1)
first term=a
2nd term n2= ar^(2-1)= ar
3rd term n3= ar^(3-1)= ar^2

the second term is nine less than the frst
a- ar=9.....i
the second term and thrd term add up to give 30
ar+ ar^2 =30
solve simultaneously

haha .. one gets the same answers though. this methods clears my mind up! Thanks