# General Thoughts: Mathematics Extension 1 (1 Viewer)

#### atargainz

##### Active Member
doesn't look too difficult besides maybe the very last question, cut off will probably be the similar to last year around 80 give or take 1 or 2 (as a percentage)

#### aanthnnyyy

##### Active Member
so angry. Bombed out

##### gone ghost
it was easier than what I expexted zzzzz anyone can explain the last probability?

#### iforgotmyname

##### Metallic Oxide
Idk felt so pressured today. Never had this feeling. It was almost as if the entire hsc was based around ext 1 maths.

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#### atargainz

##### Active Member
Idk felt so pressured today. Never had this feeling. It was almost as if the entire hsc was based around ext 1 maths.

Sent from my iPhone using Tapatalk
you'll be right, go study for physics now lol

#### luhanbby

##### Member
am i the only one that didnt do well omg :/

#### Drsoccerball

##### Well-Known Member
it was easier than what I expexted zzzzz anyone can explain the last probability?
The probability A wins was 1/2 so you find an equation for probability up to n and then multiply both sidens by 2^(n+1) to obtain the answer.

#### penguinjgp

##### New Member
the second question of the projectile motion, is it asking the position of the projectile is making with the horizontal or the velocity? cause the third question kind of ask for it again if its the velocity

#### thomasdo1

##### Member
it was easier than what I expexted zzzzz anyone can explain the last probability?

the 7th game has to be a win, therefore probability of 1/2 is locked in
any of the remaining 6 has to have exactly 4 wins so 6C4 (1/2)^6 so multiply in the 7th game

for part i

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#### Mathsisfun15

##### Active Member
Was I the only one who didn't show working for the first 2 circle geo because the verb was what is and the other one had a different verb which explicitly asked for working?
Will I lose a mark for this?

#### BLIT2014

##### The pessimistic optimist.
Moderator
How to determine state ranks if entire james ruse gets 100 raw?
They'd look at the setting out of answers.

#### lekawaiicupcake

##### New Member
Found it pretty easy, but I lost 1 mark to a stupid mistake >.<
I feel as if everyone who state ranks this year will get 100%

#### Mathsisfun15

##### Active Member
I wish I showed it to be safe. So worried now

##### Breaking the limits.
Should've done past papers. I didn't know how to tackle like half of them.

Solved about 90% of Question 11, 50% of Question 12, 25% of Question 13 and like 10% of Question 14. Multiple choice was probably an 8/10.

Shit, now I don't have a safety net.

#### spatula232

##### Active Member
Was I the only one who didn't show working for the first 2 circle geo because the verb was what is and the other one had a different verb which explicitly asked for working?
Will I lose a mark for this?
As if you wouldn't show it anyway?

#### Bozzin8R

##### Member
People saying 58 raw will be B6 cut off are way off. You need to remember the majority of the cohort aren't getting these high marks. The cut off is usually between 48-52/70 and this year will be no different.

#### Thjv

##### Member
You were not required to provide a proof for finding the angles in the first two parts.

#### Hazabot

##### Tutor
The probability A wins was 1/2 so you find an equation for probability up to n and then multiply both sidens by 2^(n+1) to obtain the answer.
Hey be careful bro, it was 2^(2n) so you had to multiply by 2^(2n +1)

#### Zlatman

##### Member
Solution to final probability question:

EDIT: there's a mistake in the final line, the second term on the RHS shouldn't have a half. (wording isn't great, but you get the picture)

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#### aanthnnyyy

##### Active Member
Should've done past papers. I didn't know how to tackle like half of them.

Solved about 90% of Question 11, 50% of Question 12, 25% of Question 13 and like 10% of Question 14. Multiple choice was probably an 8/10.

Shit, now I don't have a safety net.
Finally someone who can make me feel better