Bucket's Questions

[bucket]

Lol, thank god.

Anyway new question, bit fuzzy with inequalities :S.

"Find the set of values for x for which "

[dekoyl]

First, consider the part. We want to find the intersection of this with







or First set of answers (look at the graph if you're not sure).

also intercepts near the stationary point of the graph at...

(I do this because we can flip it on the x-axis to get what we want later)



or

when and or

Sorry if I made any mistakes but hope you got the gist of it.


Fruck 2:34am, need to memorise 80 Latin words and yet I'm still browsing VN.

[Mao]

in the first case,

in the second case,

hence, the solution is

dekoyl: your "2>x<3" is a little stuffed

[dekoyl]

dekoyl: your "2>x<3" is a little stuffed

Ah thanks. 

You presented your answer in a much neater way *takes note*.

[bucket]

Mmm, I recently came across a binomial distribution problem in an exam 1 trial paper, and I realised I have no fucking idea how to evaluate them.
So, how would you evaluate something such as...say...

This isn't from the actual question but I came up with an expression similar to this.

[shinny]

Well I assume your main problem is the
Basically;








As for the two powers, just do it by hand I guess =\

[bucket]

yeah the ncr thing was what was fucking me up, thanks a lot man.

[Mao]

people often think of combinatorics in the difficult way.

this is my way of deciphering it:

10C5 = 10*9*8*7*6 / 1*2*3*4*5

i.e. counting down from 10, get 5 numbers. then counting up from 1, get 5 numbers.
the "n" controls where you start up the top, and the "r" controls how many numbers you count

so 20C3 = 20*19*18/1*2*3, 7C2 = 7*6/1*2

[dekoyl]

people often think of combinatorics in the difficult way.

this is my way of deciphering it:

10C5 = 10*9*8*7*6 / 1*2*3*4*5

i.e. counting down from 10, get 5 numbers. then counting up from 1, get 5 numbers.
the "n" controls where you start up the top, and the "r" controls how many numbers you count

so 20C3 = 20*19*18/1*2*3, 7C2 = 7*6/1*2

I was taught the same way last year but I've forgotten it. Thanks for bringing it up Mao.

[bucket]

Hey I was doing a trial exam and I got the answer and when i looked up the answer it was corrext, but expressed as . Do you think I would be marked incorrect if it were in the real exam? The question did not say "in simplest form".

[Collin Li]

Yeah, that seems acceptable.

[Mao]

Hey I was doing a trial exam and I got the answer and when i looked up the answer it was corrext, but expressed as . Do you think I would be marked incorrect if it were in the real exam? The question did not say "in simplest form".

I've heard from MAV that they do need the simplest surd, but not the simplest fraction

i.e. is not acceptable, but is...

[bucket]

meh, i never seem to remember to simplify surds

[bucket]

Mmm, whenever I do a trial exam I always fuck up when i need to manually plot a trig graph. Does anybody have any tricks for doing these? I have the most difficulty determining endpoints and the y intercept whenever the graph is translated in any direction.

[fredrick]

Mmm, whenever I do a trial exam I always fuck up when i need to manually plot a trig graph. Does anybody have any tricks for doing these? I have the most difficulty determining endpoints and the y intercept whenever the graph is translated in any direction.

I find the intercepts and max/min values and then endpoints and go from there, but i agree i hate skecting those