Qualification > Math
Additional Math Help HERE ONLY...!
BlackBunny103:
--- Quote from: J.Darren on June 09, 2010, 11:56:14 am ---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 ?
--- End quote ---
I actually forgot what I got for OC. :P What did you get? Perhaps, it'll jog my memory a bit.
J.Darren:
--- Quote from: Deniz on June 09, 2010, 11:57:23 am ---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?
--- End quote ---
i) 5C3 * 4C1
ii) 2 Rolling Stones + 2 Others
2C2 * 7C2
2 Beatles + 2 Others
4C2 * 5C2
2 Abba + 2 Others
3C2 * 6C2
Add them all together.
J.Darren:
--- Quote from: BlackBunny103 on June 09, 2010, 11:58:14 am ---I actually forgot what I got for OC. :P What did you get? Perhaps, it'll jog my memory a bit.
--- End quote ---
I got 63 subtracted by something for i ...
BlackBunny103:
--- Quote from: J.Darren on June 09, 2010, 11:59:47 am ---I got 63 subtracted by something for i ...
--- End quote ---
Yesh ;D, I remember getting 63j - _i what I've forgotten ;D YAY
Which part did you choose for Q12? I went for the second one, it was so easy.
J.Darren:
--- Quote from: BlackBunny103 on June 09, 2010, 12:01:36 pm ---Yesh ;D, I remember getting 63j - _i what I've forgotten ;D YAY
Which part did you choose for Q12? I went for the second one, it was so easy.
--- End quote ---
Most of my mates did EITHER. I did EITHER as well ... however it seems that virtually everyone has gotten a negative answer for area under the curve :o
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