Well, the nCk is there because it tells us the number of ways we can achieve the desired of outcomes of k favourable results and n-k unfavourable results.
So are you saying i should or shouldn't have it there?
Question from SGHS 2012 Trial:
12b) The probability that it rains on any particular day in London is 2/3.
ii) What is the probability that it will rain on only two days during a whole week in London, and that these two days are consecutive?
My working:
There are six ways of having...
I reckon the CSSA papers better reflect the HSC; Independent papers have a lot more longer response questions, which there aren't that many of in the actual HSC.
yeah i think i did see that somewhere. I was just curious as to what others were getting etc. In the trial I did about 660 for ER and maybe 800 for report, so quite similar.
Yep, dw you're all over it! You should download "Geogebra", a free graphing program which makes it really easy to see whats happening with graphs and why a graph looks like it does.
no, your answer is correct for the vertex and focus you specified.
The answer they have given swaps the co-ordinates of the vertex and the focus. i.e. focus(-1,1), vertex (-3,1).
for Q13 set up an equation like M = Ae^{-kt} and use the conditions t=0, M=A and then t=1600, M=A/2 to find k, which you can then use to work out the percentage. Just be careful with what percentage has decomposed vs what percentage is remaining.
well they are examples of strategies, but the true strategic role of operations is pretty much what Examine says.
Its ensuring resources are managed and allocated in a way that ensures the needs of the customer are met in the most effective and efficient way.