11/09/2007
11:31 pm
hm... gp lecture today. super boring. z z z. so I took out P & C to do.. actually quite fun lol. did until q7 i think.
how to do this?
there are 9 marbles, 4 red, 4 white, 1 black.
find the no. of ways where no red marble is beside a black one..
drives me crazy...i cannot do this one >.<
waiting by the river|`