Mathematics: Post your doubts here!

[Rutzaba]

i have a question, the paper its from isnt here on xtremepapers, its june 2002 paper 6, q5,
question is: the digits of number 1223678 can be rearraged to give many different 7 digit umbers. find how many 7-digit diferent numbers can be made if
i) there are no restrictions on the order of digits
ii) the digits 1,3,7 are (in any order) are next to each other
iii) these 7 digit numbers are even.

any help?

i) 7!/2!
ii) consider 1 3 and 7 to be in a box and consider that box to be one dash
_ * 7 *6*5*4*3*2*1

number if dashes 8 and inside the box 3!
so 8!*3! /2! because 2 comes twice thats y we divide

iii) that means they wud end at 2,2,6,8
6! *4 /2!

 

[TaffsAsLevel]

you did everything correct except you have to subract x=1+s with -3 as shown in the question (r-3i) which means r has to subtracted from vector (3,0,0) j and k are zero in this case

Thank you dear

 

[xhizors]

jazakAllah sis!

 

[xhizors]

Esme
Q2,
Q5(iv)
Q10(i,ii)
Please can u share your working!
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_31.pdf

 

[D0cEngi]

Plz anyone help me with ques no 6 part (i) of this paper : http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_32.pdf

 

[applepie1996]

Esme
Q2,
Q5(iv)
Q10(i,ii)
Please can u share your working!
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_31.pdf

question 2 ) 5^(x-1) = 5^x - 5
now take the 5^(x-1) on the right side and the -5 to the left side so that all the x's are on one side
now you get 5=5^x-5^(x-1)
open up 5^(x-1) you get 5^x * 5^-1 substitute this in equation
take 5^x as a common factor
5=5^x(1-5^-1)
5/(1/5^-1)=5^x
log 6.25 = x log 5
x=1.14

 

[iKhaled]

I got the diameter and radius... I was wondering how would we find out the mid- point and I just understood!! We had to use the coordinate geometry formula for mid-point of the two points! Can't believe I didn't think of that before ! Thank you soo much. May Allah bless you and grant you success in this life and in the Hereafter

ohh dat was easy ! i totally forgot that haha

 

[applepie1996]

Esme
Q2,
Q5(iv)
Q10(i,ii)
Please can u share your working!
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_31.pdf

question 5 part 4
you have to integrate 2sec^2x -1 +2secxtanx
after integrating this you get 2 tanx -x + 2 secx
put in the limits >>>> 2tan(pi/4)-(pi/4)+2sec(pi/4) - (2tan0-0-2sec0)
=2-pi/4+2sqrt2-2
=2sqrt2-pi/4
take 1/4 as a common factor and you get 1/4(8sqrt2-pi)

 

[xhizors]

question 2 ) 5^(x-1) = 5^x - 5
now take the 5^(x-1) on the right side and the -5 to the left side so that all the x's are on one side
now you get 5=5^x-5^(x-1)
open up 5^(x-1) you get 5^x * 5^-1 substitute this in equation
take 5^x as a common factor
5=5^x(1-5^-1)
5/(1/5^-1)=5^x
log 6.25 = x log 5
x=1.14

brillilant and simply awesome, May Allah give you immense Success Ameen

 

[xhizors]

question 5 part 4
you have to integrate 2sec^2x -1 +2secxtanx
after integrating this you get 2 tanx -x + 2 secx
put in the limits >>>> 2tan(pi/4)-(pi/4)+2sec(pi/4) - (2tan0-0-2sec0)
=2-pi/4+2sqrt2-2
=2sqrt2-pi/4
take 1/4 as a common factor and you get 1/4(8sqrt2-pi)

what is the integral of 2secxtanx ?

 

[iKhaled]

what is the integral of 2secxtanx ?

dude the trick in that question is this part..if u check in the question it says if y = sec x then dy/dx is sec(x)tan(x) so i guess this just answered the question u have asked

 

[applepie1996]

what is the integral of 2secxtanx ?

its sec x

 

[kiara15]

For June 2012, p63, q3-
aaah thaaaank u so much for explaination, yeah i do understand, wil try to practise other,,, god bless abunduntly ameen... best guider ever seen!
p.s=if i got problems then i will ask fromm u, be ready heheh

 

[kiara15]

[quote="2,
thaaaaaaaaaaaank u so much once again, u guide very good...... thnkuu..... got very less time but atleast concept about these ambigous questions got clear! be blessed

god help those who help others

 

[kiara15]

does any body have MATHS P3 VECTORS notes ?? please i need help urgent ??

i need notes too

 

[Esme]

i need notes too

Check the previous posts, I and another member have posted them

 

[iKhaled]

hey how can i solve question 7(ii) oct/nov 2012 paper 33

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_33.pdf

 

[xhizors]

Please do tell me if you didn't understand:
View attachment 26398

lol i just end up solving for him

 

[xhizors]

dude the trick in that question is this part..if u check in the question it says if y = sec x then dy/dx is sec(x)tan(x) so i guess this just answered the question u have asked

hehe lol lol lol Thanks buddy

 

[kiara15]

Check the previous posts, I and another member have posted them

ok thaaank u, god bless u