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Additional Math Help HERE ONLY...!

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BlackBunny103:

--- Quote from: J.Darren on June 09, 2010, 11:51:49 am ---VECTORS !? I don't recall seeing any vectors in my paper :O

9P : 55Q - Yup.

--- End quote ---

Hey Darren, you're doing variant 2 right since you also got the same ratio as I did for the 2 sector areas.
There was a vector question, it was question 3, I remember.

xlane:
sum please help me wid this question..oct/nov paper 1 number 12 or..hw do u prove da 1zt part (i)...

Ghost Of Highbury:

--- Quote from: xlane on June 09, 2010, 11:27:50 am ---could sum1 plz help me out wid this crap sum...oct/nov 2003 paper 1..12 or...hw to prove da part (i)...urgent

--- End quote ---

ok first use similar triangles to determine this (check the attached image for the similar triangles)

ABC is similar to DEC

that means

30/12 = h/(12-r)

5/2 = h/(12-r)

2h = 60-5r

h = (60-5r)/2

V = pi*r^2*h

V = pi*r^2* (60-5r)/2 = r^2pi * (60-5r)/2 = pi(30r^2 - 5r^3/2)

J.Darren:

--- Quote from: BlackBunny103 on June 09, 2010, 11:54:30 am ---Hey Darren, you're doing variant 2 right since you also got the same ratio as I did for the 2 sector areas.
There was a vector question, it was question 3, I remember.

--- End quote ---
Yup I recalled the question, I am guessing that P2 is going to be easy as all the hard topics were featured in yesterday's paper ...

By the way what did you got for OC ?

Deniz:
A student has a collection of 9 CDs, of which 4 are by the Beatles, 3 are by Abba and 2 are by the
Rolling Stones. She selects 4 of the CDs from her collection. Calculate the number of ways in which
she can make her selection if
(i) her selection must contain her favourite Beatles CD, [2]
(ii) her selection must contain 2 CDs by one group and 2 CDs by another.


can some1 explain how to solve this question?

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