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$As a check on your answer, check that it is less than the number of ways to form two teams of two from 10 people, which is $\binom{10}{2}\times \binom{8}{2}\times \frac{1}{2!}=630$.$

$Let's treat the two sides of the tennis court (say the north side and south side) as different. We'll divide by $2$ at the end to make up for this.$ $First, we'll choose the pair for the north side. We can pick the male player in $5$ ways and his partner in $4$ ways (as the doubles partner...

Re: MX2 2015 Integration Marathon $Yes:$ $Let $I=\int \frac{\sin ^{-1}x}{x^2}\text{ d}x$. By integration by parts, we have$ $$I = -\frac{1}{x}\sin ^{-1}x - \int -\frac{1}{x}\times \frac{1}{\sqrt{1-x^2}}\text{ d}x $$ $$= -\frac{1}{x}\sin ^{-1}x + \underbrace{\int...

Think of it like every hour of that game you play now is 0.5 (or something) off your ATAR.

If you're that desperate to know, why not just check it on Paint or something (zoom in heaps so you can count pixels)?

Lol what does that black line / grey line thing have to do with anything?

Lol as expected, equilibrium constant question was standard (they never really ask you harder ones).

Those 4 years of compulsory science are also just rote learning. And I don't know why the Board did what it did to the science courses; yes, if people find it too hard, they don't need to study it and have other options available. Maybe there was pressure from parents or other parties claiming...

Actually, it's not against NSW law to do that: http://www.kangraphotos.com/reference/p_and_c/nsw_photo_rights.pdf

Well apparently that was part of the reason for the changing of the syllabus in 2001 to a history/social impact based syllabus.

Was the OP one of the users who got it?

Wasn't part of the reason for dumbing down the science courses that there weren't enough qualified teachers to teach it? I have also heard that other reasons included that there was a steady decline in the number of students taking the science courses because they were "too hard", and also that...

Nothing mind-blowing, it is to be expected of floating point arithmetic.

Would take a while to sort them into alphabetical order.

re: HSC Chemistry Marathon Archive $In summary, if our datum $d$ has $N$ significant figures, then $\log_{10} d$ should be reported to $N$ decimal \textsl{places} (the integer part of the log indicates the order of magnitude, and is not a significant figure, so we only round the part after the...

re: HSC Chemistry Marathon Archive $Note however that the real rule for taking logs to the base 10 with sig. figs is to apply the typical sig. fig. to the \textsl{mantissa} of the answer (i.e. the part after the decimal point of the logarithm's value). So say we're given a concentration of...

re: HSC Chemistry Marathon Archive Yeah that's 1 sig. fig.

Must avoid silly mistakes.

For HSC Chemistry, if it's too easy, they'll probably mark harshly. If it's hard, they'll mark more leniently probably.

Lol this thread will probably get deleted soon, or all posts removed and reused for after the actual exam. Hopefully the thread doesn't get removed; if anything, hopefully just moved to somewhere else, haha.