Carrotsticks' 2014 Extension 1 HSC Solutions (1 Viewer)

Carrotsticks

Retired
That is fine, you are just re-proving the result from part (i).

You might lose a mark for saying "A pattern is emerging". It's an Extension 1 paper not a damn movie trailer.

i'm the cook
Trying to cram the other method of doing the locus problem into the gap on page 10, fingers crossed that it can fit!
for that question, i showed distance QS = a, not quite as elegant as braintic's solution but it worked

Kurosaki

True Fail Kid
Haha 'A pattern is emerging'.

i'm the cook
That is fine, you are just re-proving the result from part (i).

You might lose a mark for saying "A pattern is emerging". It's an Extension 1 paper not a damn movie trailer.
laughed at this

mreditor16

Well-Known Member
That is fine, you are just re-proving the result from part (i).

You might lose a mark for saying "A pattern is emerging". It's an Extension 1 paper not a damn movie trailer.
lol so is it a full-proof solution? are there any weaknesses in it? asking since they differentiate state-rankers by the quality of their working, and I think I have a chance

New Member
For MC q7, why cant B be the answer?

RIP3U

New Member
OKAY HOLD UP BOYS.

I GOT A QUESTION.

QUESTION ELEVEN B (rain)

The question asks that you "write an expression for the probability that it rains on fewer than 3 days in November"

Considering this, i only worked out P(1 days) + P(2 days) since with (0 days), it doesn't rain, thus shouldn't be included in the probability that it "rains on fewer than 3 days".

THOUGHTS? (pls i wouldn't mind not losing a mark trollface.jpg)

Kurosaki

True Fail Kid
For MC q7, why cant B be the answer?
try integrating, you will see that the amplitude is not 5.

mreditor16

Well-Known Member
OKAY HOLD UP BOYS.

I GOT A QUESTION.

QUESTION ELEVEN B (rain)

The question asks that you "write an expression for the probability that it rains on fewer than 3 days in November"

Considering this, i only worked out P(1 days) + P(2 days) since with (0 days), it doesn't rain, thus shouldn't be included in the probability that it "rains on fewer than 3 days".

THOUGHTS? (pls i wouldn't mind not losing a mark trollface.jpg)
lol mindgames

mreditor16

Well-Known Member
lol so is it a full-proof solution? are there any weaknesses in it? asking since they differentiate state-rankers by the quality of their working, and I think I have a chance
Carret?

Kurosaki

True Fail Kid

I think you just ripped everyone's 3u

nah srs I'm pretty sure "fewer than 3" includes 0 because... by the principle of mathematical induction 0 < 3 for all values of n.
st8 rank right there

Carrotsticks

Retired
for that question, i showed distance QS = a, not quite as elegant as braintic's solution but it worked
I really hope that students using the same method as the one braintic demonstrated were not penalised for stating things such as the gradient of the tangent at P being t and the reflection property, without proof.

lol so is it a full-proof solution? are there any weaknesses in it? asking since they differentiate state-rankers by the quality of their working, and I think I have a chance
Yes, the solution is 'fool-proof'. However, it seems like your spelling isn't =)

OKAY HOLD UP BOYS.

I GOT A QUESTION.

QUESTION ELEVEN B (rain)

The question asks that you "write an expression for the probability that it rains on fewer than 3 days in November"

Considering this, i only worked out P(1 days) + P(2 days) since with (0 days), it doesn't rain, thus shouldn't be included in the probability that it "rains on fewer than 3 days".

THOUGHTS? (pls i wouldn't mind not losing a mark trollface.jpg)
That will get you one mark out of two.

Oh never mind, I skimmed and thought your justification was for why 0 was to be included, not why 0 is NOT to be included.

You may or may not get a mark. Leaning towards not.

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mreditor16

Well-Known Member
Yes, the solution is 'fool-proof'. However, it seems like your spelling isn't =)

mreditor16

Well-Known Member
thanks kuro <3

brb calculating the binomial probability of my 3u state rank!!!!!
0?

mreditor16

Well-Known Member
Carret, how do they determine the order of state rankings? especially if they all got the same raw mark??

is it true they compare the quality of working out??

Kurosaki

True Fail Kid

If I used auxiliary angle and then products to sums for Q 14 (iv) from part (ii), and then quoted that $\bg_white -1 \leq \cos x \leq 1$, to show max D has a max value would that be accepted?

Carrotsticks

Retired
Carret, how do they determine the order of state rankings? especially if they all got the same raw mark??

is it true they compare the quality of working out??
I cannot say anything with absolute certainty.

Difficult to say because D in fact has many maxima/minima, just need to find the one in the right domain. I'm not sure if your friend made that connection.

bio4lyf

Member
for one of the integration questions (3 marks) i wrote 1/2 in front instead of 2 which was the rite answer..... how many marks am i going to lose???

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