Hi,

I am doing QCE Methods U3 and 4 now. Started this term. To prepare for the upcoming year I went to the Unit 1 and 2 content to make sure I know everything very well.

So.. I finished this 'revision' a week ago. I can fluently complete nearly all questions from all chapters except "Combinations" and "Permutations"

I have spent ages trying to understand this topic well, but some complex unfamilier and oddly written complex familiar questions still trip me up. Sometimes the wording and how we are soppoused to answer.

I have looked at the unit 3 and 4 syllubus. In unit 3 is all about derivatives, however in unit 4. continous random variables, distribution, sample proportion and confidence intervals pop up.

A friend told me that nCr is used in these. However, I would like to know is nPr and nCr are needed. And for the ones that are neessecary for Unit 3 and 4, what kind of questions are likely to pop up (wordy questions where we find the possible arrangments with restrains such as 'containing two vowels and two different consonants)

Thanks alot!!