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If you can get your hands on them Independents (S&G) are quite good, I find older CSSA papers (maybe 2006 and below) are quite good but the newer ones are pretty easy

The Perms booklet? Sorry if Im bothering you

Re: 2U Maths marathon For what given domain? This is 2U Because by observation I can say x=0 is a solution.

Am I right in saying that Q15 was one of the easier questions? I was able to get 8/15 for it without any 4U knowledge

Good luck!

Lets find the general rth term of the expansion which will give us a constant term: \binom{n}{r} (x^2)^{r} (-1 x^{-1})^{n-r}=kx^0 Lets disregard co-efficients for now and find r such that we get x^0 in the end: x^{2r} \times x^{r-n}=x^0 \\ \\ 2r+r-n=0 \\ \\ n=3r We have found a result...

For Q11 a, is there an efficient solution, or is it just t formula and then polynomial division? Thats what I did but I feel like there should be a faster way

Hopefully Q16 will be Harder 3U so I can have a go at it lol

Re: The p00n thread Placebo mate, if you truly think you can do well, like truly think it not just the fake thought of 'hey I can probably get good'. You might think you are motivated when in reality your motivation is nothing next to other people, hence you get lower than them. Real belief is...

Re: The p00n thread Hard work can only get you so far. While being pessimistic you may still be able to achieve, 'above average' or rather 'good enough', it takes real intuition and skill to be better than the best, to be able to achieve 'really good'. In order to become really good, belief is...

Ah that is genius heh. Well this method will probably help me with alot of perms questions. Thanks (and props to carrot of course)

Could you explain how you got 8 spots left for vowels?

I still cant to that perms one lol, can someone post their solution up

I think Ive got it: I cant be bothered latexing it all up

Yeah when I was doing that question I got up to the n/2 step but I didnt want to continue because I thought it was mathematically incorrect to assume n was even lol. So I ended up not doing it :/

Did anyone get the last perms question? part biii of Q11

The first one is D, the period is \frac{2\pi}{n} And the acclereation is: \ddot{x}=-b^2 x So n=b, so the period is 2pi/b rather than just b :/ But other than that I got the same as you (except for 8, but I rechecked my answer and I found a mistake, and found that yours was right)

Good luck for the 4U paper mate, hope you get well soon :)

I had a case of stomach acid since the early morning, taking the antacid tablets didnt work, and my stomach just failed me all throughout the exam the pain didnt allow me to concentrate or do anything :( So I just stopped doing the exam after Q11 and Pmed carrot my situation. I went to sleep...

Here are my solutions to the Projectile Motion question: And for the last question since I ran out of room: $For all k$ \ \ 0<k<1 \\ 1-k<1+k \\ \\ \therefore \sqrt{\frac{1-k}{1+k}}<1 \\ \\ \therefore \frac{t_r}{t_{v_0}}<1 \\ \\ T_R<T_{V_0} And the physical meaning is that it is faster to...