Maths, Addmaths and Statistics: Post your doubts here!

[TheStallion-Reborn]

pleasure!

and itz ar^(n-1)

last post edited. have a look please

 

[falcon678]

last post edited. have a look please

ummm ok....it wnt hapnd like thtit wld be like ummmm 5 1o 20 40 80 160.....
here v find the ratio by dividing the term by the term wich is behind it immediatly....
like here 'r' is 20/10=10/5=160/80
n then by using the formula u can find the term...
lets check by finding the 3rd term
ar^(n-1)
5x2^(3-1)
5x2^2
5x4=20

the ratio wld always b constant if differnce is not!

hope it cleard the point....

 

[TheStallion-Reborn]

ummm ok....it wnt hapnd like thtit wld be like ummmm 5 1o 20 40 80 160.....
here v find the ratio by dividing the term by the term wich is behind it immediatly....
like here 'r' is 20/10=10/5=160/80
n then by using the formula u can find the term...
lets check by finding the 3rd term
ar^(n-1)
5x2^(3-1)
5x2^2
5x4=20

the ratio wld always b constant if differnce is not!

hope it cleard the point....

thanksieee!

 

[falcon678]

thanksieee!

no prob!

 

[asma tareen]

http://papers.xtremepapers.com/CIE/...(Calculator Version) (4024)/4024_w06_qp_2.pdf
can anyone help me plz??
Q9 c 1 and 2

 

[Saad Mughal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w06_qp_2.pdf
can anyone help me plz??
Q9 c 1 and 2

Lengthy.
BAC = 90
Calculate BC using Pythagoras theorem,
Apply sin BCN = BN/BC to get angle BCN (13.8 deg.)

For (ii),
Calculate BD using BD=BN/sin BDN, BD = (164 approx.)
Apply cos DBA = AB/BD (50.8 deg.)

Sorry, couldn't give full solutions, they're lengthy.

 

[asma tareen]

Lengthy.
BAC = 90
Calculate BC using Pythagoras theorem,
Apply sin BCN = BN/BC to get angle BCN (13.8 deg.)

For (ii),
Calculate BD using BD=BN/sin BDN, BD = (164 approx.)
Apply cos DBA = AB/BD (50.8 deg.)

Sorry, couldn't give full solutions, they're lengthy.

its fyn i got the method thnx

 

[Suchal Riaz]

Is there anything i m missing or CIE made an error:

4.5km/m/s=1.5 hours?
would not we convert km in meter then divide by speed to get seconds then divide by 60 to get minutes

 

[Saad Mughal]

Is there anything i m missing or CIE made an error:
View attachment 23901
4.5km/m/s=1.5 hours?
would not we convert km in meter then divide by speed to get seconds then divide by 60 to get minutes

Yeah, CIE has made a mistake.
You can see the answer, 06 50 can only come if you make the proper conversions (25 min. would come) and then subtract from 07 15.
The examiner would have noted this while checking obviously.

 

[asma tareen]

Is there anything i m missing or CIE made an error:
View attachment 23901
4.5km/m/s=1.5 hours?
would not we convert km in meter then divide by speed to get seconds then divide by 60 to get minutes

:O i never thought CIE makes mistakes :O

 

[Saad Mughal]

:O i never thought CIE makes mistakes :O

You do know that CIE is managed and run by HUMANS, don't you?
Besides, this is a minor mistake (in the method mark), I've seen mistakes in answers.

 

[asma tareen]

but still they should have rechecked their mistakes we're the one's who wud be effected cux ov it

You do know that CIE is managed and run by HUMANS, don't you?
Besides, this is a minor mistake (in the method mark), I've seen mistakes in answers.

 

[Saad Mughal]

but still they should have rechecked their mistakes we're the one's who wud be effected cux ov it

Actually no, errors do appear in mark schemes over the years, the examiner doesn't just blindly check the papers, he goes through them and there is obviously a mistake in the MARK SCHEME and not the answers of the candidates. So, don't worry.

 

[asma tareen]

hmm well thn i dont gv a damn to em

Actually no, errors do appear in mark schemes over the years, the examiner doesn't just blindly check the papers, he goes through them and there is obviously a mistake in the MARK SCHEME and not the answers of the candidates. So, don't worry.

 

[Suchal Riaz]

my answer is correct but A1 can only be given when M1 is given(according to second page of same markschemee)
so?

 

[Suchal Riaz]

asma tareen there is even an error in w12 addmaths. whole answer is wrong!

 

[asma tareen]

asma tareen there is even an error in w12 addmaths. whole answer is wrong!

i dont take add maths so i shouldnt be worried

 

[Saad Mughal]

my answer is correct but A1 can only be given when M1 is given(according to second page of same markschemee)
so?

Actually, you'll get the full marks (unless you don't show proper working), this is because when the answer is correct, the examiner checks the working and marks it. Since, logically and sensibly, our working is CORRECT, we will get the marks. CIE doesn't deprive their candidates of marks this way.

 

[Saad Mughal]

i dont take add maths so i shouldnt be worried

He's just telling you that even things like that happen.

 

[Suchal Riaz]

i dont take add maths so i shouldnt be worried

u should not be worried anyway. even is there is an error in markscheme the examiners are not blind.