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Re: 2015 permutation X2 marathon Dont know if this question is hard enough to be X2, but anyways... A classic b-day problem: 30 people in a room, what is the probability that at least 2 people have the same b-day Answer: 71%

c) take the integral twice, making sure you solve for +c each time by subbing known variables. d) let v=0 , solve for t, plug it in a to test for max. sub it back into x to get ans

I find that mistakes cost me more marks than curveball Qs; so am curious about the misconceptions/common mistakes that you've come across or/seen made in the 4U exam.

Drop the ones you least like, or i fyou like em all, drop the worst scaling

There is a huge misconception about the Soft drink experiment. Most schools perform it incorrectly, so you should prob look into it

The combustion of ethanol is assumed to occur in cars (i.e. as a fuel blend) Therefore it is assumed to be aq, but I dont believe you will be penalised if you write (l)

If you're getting <80% you need to work harder If you're getting >80% you need to work smarter If you're getting >95% you need to work on your essays homie

I can tell you the most common pracs are: - Pendulum (Most marks will be allocated here) - Motors and generators: Either Transforemers/Induction of AC or both - Ideas: CRT

re: HSC Chemistry Marathon Archive The burns are real

Should be correct, I also got B

^ Well there were no long responses, so yeah....

This is beyond the syllabus, prob in uni

Nice, in ESL and topping ECO is a huge feat

They're worse than MIF for maths

School rank 400+ Eng Adv: 4/15 Phy: 1/12 90%+ (Independent paper) Chem: 1/12 90% (Ind paper) Ext 2 Maths: 2/5 Ext 1: 1/8

^ But you also have to test for odd values -> yielding an even number of terms and thus cancelling ALL the 2ln2 Testing for evens give you a single 2ln2 left

https://www.dropbox.com/s/fjbrtc9pebchjcp/2015-08-13%2013.12.23.jpg?dl=0 What's the answer to the superconductor Q I'm confused between C and D

https://www.dropbox.com/s/sz2wz31emb3sqge/2015-08-13%2013.03.30.jpg?dl=0 What's the answer to this I'm confused between C and D

When they ask for oxidising/reducing agent, this is always found on the left hand side of the equation. H is always 1+, O is always 2-, (in HSC anyways) So you can eliminate those immediately Now oxidising agent is almost always the one undergoing reduction (a reduction in oxidation number e.g...

Account for the stability of electrons in an atom (Q2Q) 2mks - So this question was posed to us BEFORE we learnt about De Broglie. - Teacher states that my answer involving De Broglie "Standing waves" is invalid (I scored 0/2), as "we have not learnt it yet" - Instead, my teacher was looking...