these kind of problems you do not solve with equations (at least I wouldn't know how), you use permutations (for instance 5!=5*4*3*2*1) Not sure how to give an easy explaination; 14 is the number of steps and for k you can choose either the steps down (4) or to the right(10), doesn't matter, as you multiply it by (n - k). A few keystrokes on your calculator and you're there.
$this->bbcode_second_pass_quote('Bas', 't')hese kind of problems you do not solve with equations (at least I wouldn't know how), you use permutations (for instance 5!=5*4*3*2*1) Not sure how to give an easy explaination; 14 is the number of steps and for k you can choose either the steps down (4) or to the right(10), doesn't matter, as you multiply it by (n - k). A few keystrokes on your calculator and you're there.
Right, so it's 14 choose 4 (same as 14 choose 10), which is an equation but I can't format it here. So the general equation would be (c+r) choose c (or r). Thanks.
Oh, and I did know what combinatorics was, and permutations and combinations.
ah ok, I personally got confused by the english terms for some mathematical concepts, like "choose", also the term "equation" I do not use in the context of a problem like this in Dutch :S
Anyway, it's nice to brush up on good old math keep 'em coming Jason (and what's the answer according to you btw?)
$this->bbcode_second_pass_quote('jasonraymondson', ' ') ya lol. But hey, you were on the right path. Our resident math instructor didn't even attempt the problem
$this->bbcode_second_pass_quote('Bas', '')$this->bbcode_second_pass_quote('jasonraymondson', ' ') ya lol. But hey, you were on the right path. Our resident math instructor didn't even attempt the problem
It just computational you take the row across and add to the rows going down and then divide by the rows going across factorial and multiplied by the rows going down factorial
Last edited by jasonraymondson on Sun 04 Nov 2007, 19:28:58, edited 1 time in total.
The wayward spread of the aids virus is modeled by the following function with respect to t=time=days; V(t)= -t^2+5t-7 where V(t) is the number of people since the first reported viral case was observed. use the "formal definition" of a derivative to find d/dt (V)(t)