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w0t the chem1901 paper seemed a lot nicer than previous years, so not sure if dunning kruger effect or not.

dead thread \\ \overrightarrow{BA} = -3i + 4j + 3k,\ \overrightarrow{BC} = i + 3j - 4k \overrightarrow{BA} \cdot \overrightarrow{BC} = -3 $As the dot product is negative the vectors make an obtuse angle.$

Because the flame doesn't ionise the sample it atomises it.

The question didn't specify that the cup was made purely from one material for q13. It just asked for the one that most likely to be used in the manufacture of the cup.

lol yeah there was an 8 mark finance in 1997, but i doubt it will show up

I haven't even looked at the 2u paper D:

Finance in q14 for sure

this question seems a lot more doable now then it did during the exam ): I still don't get how you get the result in a) ii)

Re: HSC 2013 4U Marathon \frac{x+1-1}{x+1} + \frac{x^2+1-1}{(1+x)(1+x^2)} + \frac{x^4+1-1}{(1+x)(1+x^2)(1+x^4)} + \dots = 1 - \frac{1}{x+1} + \frac{1}{x+1} - \frac{1}{(1+x)(1+x^2)} + \frac{1}{(1+x)(1+x^2)} - \frac{1}{(1+x)(1+x^2)(1+x^4)} \dots = 1 I hope that's right and you can...

Re: HSC 2013 4U Marathon I only just found this thread, these questions are so scary :S Hoping I can at least figure some of these out.