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Please stay on topic guys

You would not be expected to remember/quote them and any question in the HSC would ask you to derive it anyway (e.g. by trig substitution). Even back in the old syllabus, such questions of those variety were extremely rare.

The two outcomes you are concerned about are landing on the edge and not landing on the edge. It’s not heads/tails/edge. Effectively the heads/tails is merged into a one event with a probability of 599/600.

In principle that's okay, but what usually happens is that someone replies saying they can share it for free (thereby breaching copyright rules). At the end of the day, the last thing this site needs is a complaint from authors/publishers threatening legal action against us for breaching...

Suggest everyone have a read of this: https://www.boredofstudies.org/threads/welcome-to-the-general-discussion-on-the-2021-hsc-forum.392623/ https://www.boredofstudies.org/threads/helpful-tips-rules-for-making-the-most-out-of-the-maths-forums.359647/ We expect everyone to be aware of the above...

Since there is a hierarchy, start with a single family first. The probability that a single family will produce 2 boys and 2 girls is \binom{4}{2}\left(\dfrac{1}{2}\right)^2\left(\dfrac{1}{2}\right)^2 This gives a 3/8 probability that there will be 2 boys and 2 girls. Therefore there is a 5/8...

You would have previously learnt how to do stuff like addition/multiplication of ordinates to sketch graphs.

There is no mathematical “scaling advantage“ in being in a “higher ranked” school. The only thing that may help is the culture/resourcefulness of the school may peer pressure you to work harder. Also, a school’s ranking is something constructed by the media (e.g. ranked by number of band 6s)...

I don't think there is anything wrong with using Ext1 methods in the Adv paper. However, if you do end up using it to solve a question then that is usually a sign that the question is poorly designed. Ideally, all questions in Adv would be restrictive and targeted enough such that no one is...

If the interest of 100r% is compounded monthly then after 12 months each dollar grows by (1+r)^{12} Equate this to a growth of 6.8% (i.e. 1.068) and you can then solve for r.

@Your Friend can you please load these into the Notes & Resources section?

Alternatively, note that n(n+1) = 2(1+2+3+...+n)

Do you think we should open up a resource section for uni students to contribute? This has been something we have contemplated so it would be good to get some feedback on whether there is demand for it.

How can you possibly solve that? The problem is that you can’t avoid the fact that we live in a capitalist society so by definition, “financial discrimination“ is everywhere. As long as there is supply and demand, tutoring will always exist.

lol none of your other threads were deleted and again you’re asserting factually false information. It is quite clear you are not interested in having a constructive conversation and just want to attack so I agree to stop there.

Um...the world doesn’t revolve around you. When we monitor the threads in general, you only see the subset that involve your own posts. We look at many threads and delete posts of other users. You just don’t see them. For someone who claims they don’t have time to report posts, you’re doing...

Um...no you were asking me to provide evidence when I challenged your assertions. What did you expect? Not call out your falsehoods and have you accuse me of not showing the evidence? These posts were back in 2014/2015 (her username back then was the actual name and had to be changed). Now that...

Where are you getting your info from? You were not even warned. I just deleted the post because it is linked to another post quoting someone’s real name. The only time you have ever received a warning was for the earlier post today and even that was reversed.

I’m just going to call this out as blatantly false

See post #13 which starts the personal attack in a somewhat “soft” way - but was followed by a subsequent post I had to delete from that user because that was more direct and no longer about the subject matter. Whilst I agree that they are not as common, my point still stands that there is some...