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I would think you should do them, since you probably have SOME idea about the answer, and so have a greater than 1/4 chance of getting it right.

I added it to my post. let me know if it makes sense/if not then where

2 of my answers were correct. You are finding the permutations of the single members + included groups, subtracting the permutations of single members + included groups + excluded groups. For the first one, 1a - does it mean any 2 of C, D and F cannot be together? I assumed it meant only all 3...

I would have thought it would be 1a) 9!2! - 7!3!2! 1b) 8!2!2! - 7!2!2!2! 2) 7!2! - 6!2!2!

I got 161. Assuming only denominations are 20c, 50c, $1, $2, 20c will always come in groups of 5, and 50c in groups of 2, ie $1 groups there are 6 ways to choose the number of $2 coins, The number of combinations of other coins, using combinations with repetition ([n+k-1]!/k![n-1]!) forumula...

haha, the philosophy course sounds so stupid. I'd say you'd probably be better off just learning the more interesting stuff on your own rather than taking an extra course with apparently heaps of work and pointless topics

Re: What is the most important subject? eh? I was saying english is about presenting your/an opinion as if it were fact well ok, replace 'Higher paying job' with 'More money' since the argument was over whether money brings happiness, not having a higher paying job.

Re: What is the most important subject? isn't that what english is all about? Higher paying job = don't have to work as much = more time for other stuff, eg spending time with your kids ( = more happiness). I don't really think that it's the money/job's fault if people start getting obsessed...

yeah dividing by 2tanx is dividing by zero in this case

well ignore that part then, I'm just saying there's more serious issues to get fired up about than this.

There might be a difference in intelligence among different races.. but so what if there is?

Yeah, I don't see why this is so bad. They're not feeling pain or anything, and didn't really have good lives. I hope everyone who was really against this is vegan -.- . Plus, there'd be much more serious issues to deal with than this. Yeah, because the people who get touchy about it are...

2cos2x+1=0 2cos2x= -1 cos2x = -1/2 2x = 2pi/3, 4pi/3 +/- (2pi)k x = pi/3, 2pi/3 +/- (pi)k for -pi <= x <= pi: x = -2pi/3, -pi/3, pi/3, 2pi/3 quadrant -1 is quadrant 4 (just think about what the first quadrant would be if you were drawing your angle in reverse direction) so only cos is...

t1 = time for rock to reach pole t2 = time from pole to max height t3 = time from max height to pole height, which is time it hits bird, = t2 t.t = total time = t(1+2+3) p = pole height r = square root pole height d = distance from initial point of rock to pole (horizontal distance) Using...

that equation only works for x,y,z≥0 right?=/ well, how I solved it was let x≥0 let y=x+a let z=x+b let b≥a≥0 substitute into equation, expand, cancel out, you get 3xa^2 + 3xb^2 + a^3 + b^3 ≥ 3xab Now x, a and b are ≥ so all terms above are ≥ 0, For 3xb^2 ≥ 3xab b ≥ a which is true. Therefore...

pretty low

it doesn't follow that (x+a)(x-a) > 0, therefore x+a > 0 or x-a > 0, which is why the answer is wrong +However it would follow that either x+a and x-a > 0, or x+a and x-a <0 Therefore, x>a and x>-a or x<a and x<-a :) that sounds much better than what I had before

Oops, hadn't realised. edited mine too (again). for the x^2 > a^2, I still think you would solve as firstly: |x| > |a| Then write out the solutions with the case where it is true: x > a, where x≥0 and a≥0 x > -a, where x≥0 and a≤0 x < a, where x≤0 and a≤0 x < -a, where x≤0 and a≥0 I haven't...

that's why I added 'which then would have 4 solutions'. I just couldn't be bothered typing them out.

Re: i want to die yes yes To study for it just go over the syllabus points, get a study guide maybe. Reading the wikipedia article is pretty helpful for stuff like that too. Do past papers once you think you know the topic. Talk to people of the religion you're learning. This could possibly...