Mathematics Extension 1 Predictions/Thoughts (1 Viewer)

[Luukas.2]

lucid's solutions are attached.

epicmaths also put up his solutions in this post https://community.boredofstudies.or...lution-speedrun-send-help.405894/post-7515199 which was from the youtube

Lucid's solution for 14(c)(ii) is wrong as the vectors given as OP and OQ are actually IP and JQ. Question 10 is wrong, too.

 

[blob063540]

pretty sure q is either 1944 or 80 (not 81 or 1943) coz u gotta add one/ subtract one by the n-1 identity

wat u mean it was def 81 considering that

 

[Luukas.2]

are we talking about 12e? i made x the subject and then squared it and integrated

Yes, I'm suggesting you may have made an error in the squaring, which would explain getting the 800pi term but not the 6 ln 3... and my earlier post should have y's rather than x's, fyi... I'll go and correct it.

 

[Ant..]

Yes, I'm suggesting you may have made an error in the squaring, which would explain getting the 800pi term but not the 6 ln 3... and my earlier post should have y's rather than x's, fyi... I'll go and correct it.

ye bro im an idiot i just squared each term i didnt expand the brackets if that makes sense. im so dumb

 

[Luukas.2]

Well that's the danger of being the first to be out with solutions. You'll be first to be wrong too.

Indeed, and it is helpful to people to put out solutions... I also see it as helpful to note where they need corrections. Everyone makes mistakes.

 

[Average Boreduser]

The questions there definitely looked interesting. Whilst doable, with the time constraints and pressures of knowing this is the final exam you have for X1, I'd say this year was pretty hard.

 

[dsakvyilsa]

ugh i'm so mad about 12e I made a stupid mistake i did 1/600lny instead of 600lny......

 

[goodcat911]

does anyone have pics of the paper?

 

[WeiWeiMan]

does anyone have pics of the paper?

It’s somewhere between pages 6-10 on the thread

 

[CHarmon]

How do y'all already have the paper not even an hour after we're done? What is this sorcery?

 

[Luukas.2]

ye bro im an idiot i just squared each term i didnt expand the brackets if that makes sense. im so dumb

Everyone makes mistakes. They aren't going to say "Oh, you expanded a binomial expression incorrectly, you get 0 for the whole of Q12 plus a fifty mark penalty off your raw score!"

 

[synthesisFR]

Guys for the gym equipment q for part i, I wrote the expression then simplified it
But for part ii) I wrote the expression and used the answer from ii) and gave my final answer as a value instead of the expression
Pls don’t tell me I will lose marks for that

 

[WeiWeiMan]

Guys for the gym equipment q for part i, I wrote the expression then simplified it
But for part ii) I wrote the expression and used the answer from ii) and gave my final answer as a value instead of the expression
Pls don’t tell me I will lose marks for that

Technically you gave an expression it was just in decimals rather than indices and stuff

 

[synthesisFR]

Technically you gave an expression it was just in decimals rather than indices and stuff

thank you
Ok no one else reply to my q or I’m gonna die of stress

 

[Average Boreduser]

thank you
Ok no one else reply to my q or I’m gonna die of stress

ok

 

[WeiWeiMan]

I thought question 10 was A, as it is impossible for two students to sit next to each other (as then there is no space for the other three students between teachers), which means the only calculation is the number of ways no students can be next to each other which is 4!x3!

huh

 

[awesome245]

nvm I think I'm wrong

 

[awesome245]

How is it possible for only two students to sit next to each other, as there is no combination that works

 

[Luukas.2]

How is it possible for only two students to sit next to each other, as there is no combination that works

Start from a teacher.

The arrangement must be T-SS-T-SS-T-S-(and back to the original teacher), or one of two variations: T-SS-T-S-T-SS- and T-S-T-SS-T-SS-.

Seat first teacher in 1 way
Choose one of these 3 arrangements
Seat the two remaining teachers in 2 ways
Seat the students in 5! ways

Arrangements = 1 x 3 x 2 x 5! = 3! x 5!

 

[awesome245]

Starting from a teacher, the arrangement must be T-S-S-T-S-S-T-S-and we are back to the original teacher, or two variations T-S-S-T-S-T-S-S- and T-S-T-S-S-T-S-S-.

Seat first teacher in 1 way
Choose one of these 3 arrangements
Seat the two remaining teachers in 2 ways
Seat the students in 5! ways

Arrangements = 1 x 3 x 2 x 5! = 3! x 5!

I might be reading the question wrong, but doesn't this not work as a maximum of two students can be sat next to each other (not two pairs)?