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Re: UNSW chit chat thread 2016 This makes absolutely none sense.

I need help :( I can't focus :(

√3 sin(x) = cos(x) - 1 3sin^2(x) = cos^2(x) - 2cos(x) + 1 2cos^2(x) - cos(x) - 1 = 0 (2cos(x) + 1)(cos(x) - 1) = 0

What if r is odd in that formula? What if r is even?

Re: Discrete Maths Sem 2 2016 Understood, now. It took me a very long time to understand... what's wrong with me?!

Right... high-school sucks. When I see perms and combs, the answer is not immediate, I guess I need more practice.

What do you think is the fastest way to do that type of "mystery puzzle" in real life? Or if you were playing detective. Practice and think in formal logic? Practice deductive reasoning and use common sense? Something else?

As long as you can analyse it to prove your argument and is related to the module, it'll be fine. Aside that, does anyone have any general advice on mastering permutations and combinations?

See #modustollens on statement 3 of the question.

Re: Discrete Maths Sem 2 2016 Still feels right

Mrs Smith is lying, so Moriarty has not escaped which means Moriarty is not Jones. Lastly, Moriarty is either dead or is Jones and we know that Moriarty is not Jones which allows us to conclude that Moriarty is dead! Hard part was concluding Moriarty is not Jones given that Moriarty has not...

Re: Discrete Maths Sem 2 2016 "Changing clothes does not mean going swimming" ≡ "changing clothes means not going swimming"