Australian Maths Competition (5 Viewers)

[sinophile]

Re: How did people go in the maths comp today?

Could someone be a team player and scan it? please!

I love these comps

Last page:
http://img8.imageshack.us/img8/2518/math09.png

Second last page:
http://img39.imageshack.us/img39/781/math09two.png

the other pages have my erroneous working out scribbled all over them

 

[gurmies]

Re: How did people go in the maths comp today?

scanning..

Or i'll wait for sinophile

 

[sinophile]

Re: How did people go in the maths comp today?

scanning..

Or i'll wait for sinophile

You should do the rest, since mine has scribbles everywhere

Thank you

 

[gurmies]

Re: How did people go in the maths comp today?

lol, soz sinophile - I just stopped after seeing you were doing it!

 

[annie93]

Re: How did people go in the maths comp today?

yeah i thought it was really hard.
i am in year 10 but because our class accelerates us in maths we had to do the senior paper.
i got stuck in the 4 mark sections!
and didnt get any of the last 10 questions...
what did everyone get for the traitor one? i got 4.

 

[gurmies]

Re: How did people go in the maths comp today?

That's correct Annie.

 

[pillar]

Re: How did people go in the maths comp today?

i went pretty well up to around Q15 then got destroyed after that lol... got some of the easy ones like loyalist/traitor but that's about it

what the FUCK is an n-fold composite or whatever it said

 

[FFC]

Re: How did people go in the maths comp today?

yeah i thought it was really hard.
i am in year 10 but because our class accelerates us in maths we had to do the senior paper.
i got stuck in the 4 mark sections!
and didnt get any of the last 10 questions...
what did everyone get for the traitor one? i got 4.

yep!

Oh, and a question about the "snug" parallelogram, what did you all get for that one?

 

[gurmies]

Re: 2009 AMT Mathematics Competition

Not sure how I went. I think I got ~73 although I may have made silly errors I am unaware of. As for the cut-offs, no idea.

 

[kp888]

Re: 2009 AMT Mathematics Competition

yes pwoh, i got 42 for q26 as well =]

 

[xXmuffin0manXx]

Re: 2009 AMT Mathematics Competition

Yeh, nice. For that question i cbf even trying, I despise brute force!!!

lol i used brute force keke

started from 123 and worked my way up although..

but not like 123 then 124..i did use a little bit of intelligence

probably on my 20th attempt i found it..

 

[Puttah]

Re: How did people go in the maths comp today?

i went pretty well up to around Q15 then got destroyed after that lol... got some of the easy ones like loyalist/traitor but that's about it

what the FUCK is an n-fold composite or whatever it said

I had no idea what it was either, and it looked pretty daunting at first sight, but take a look at the examples, is a fraction with the variable x in both the numerator and denominator. , after simplifying is still a fraction with the variable still a power of 1. Following this pattern, will still be a fraction with the variable x in both the numerator and denominator with a power of 1.
Since it asked how many solutions there were to this would result in a quadratic if the denominator is multiplied through. Quadratics have 2 solutions and I think (not completely sure) but the set S means either real or complex solutions, i.e. it doesn't matter if the quadratic doesn't have any real roots. - if this isn't what it means, please elaborate how to distinguish between the answer 1 and 2.
Thus, the answer would be 2, even though I chose 2n in the midst of all the mayhem

 

[occer]

Re: How did u go in the Australian Maths Competition?

Darlinghurst you damn traitor!

 

[Lukybear]

Re: Australian Mathematics Competition

Does any1 know state rankers in math who have not recieved a HD in math comp? Just curious.

 

[nerdsforever]

Re: 2009 AMT Mathematics Competition

for cutoffs, I'm thinking:

below 30 = participation
30 = proficiency
40-55 = credit
55-70 = distinction
70 - 90 = high distinction
90+ = prize

 

[Aquawhite]

Re: How did people go in the maths comp today?

I don't think I went as well as anyone here XD... I worked a fair few out, and was going somewhere with the last question, but I didn't have time -_-

I have no idea what I would have got marks wise... the competition this year was interesting though.

 

[nerdsforever]

Re: How did people go in the maths comp today?

damn. I picked 2^n.

 

[Dumbledore]

Re: How did people go in the maths comp today?

I was tossing up between 2n and 2^n but went with 2n instead.

i don't think it was either if that was to work for all fn(x) cause f0(x) had 2 solutions to it same with f1(x) and f2(x) though it looked so simple i wasn't sure

 

[Dumbledore]

Re: How did people go in the maths comp today?

I decided the answer was two solutions. I'm fairly confident with that one, unlike most of the others after Q10.

The parallelogram fitting snugly around the 6 circles intrigued me (my way of covering up that it pissed me off really badly). I was fairly certain I had the exact answer until I looked at the choices. I mean, wtf, I expected 54(2+sqrt(3)). If anyone could walk me through that one, I'd appreciate it.

i had no idea how to work it out so i guessed using approximations, i found the area of the circles and approximated the areas of the answers, 3 of the answers i think were below the area of the circles and 1 was like 4 times the area so there was only one seeminly valid solution

EDIT: same could be used for the overlapping circles in the square one, though 2 turned out to be valid solutions

 

[Winn]

Re: How did people go in the maths comp today?

Oh...looks like Im not the only one who is freaked out about it.
i got HD last year...and i reckon i will be lucky to get a distinction this year by looking at all your discussions :S