Hello Students,

look at the directory Onderwijs/OBS-Exercises.
I want to help you by finding questions of how to solve 
certain problems/exercises. That means that I sometimes 
start with some idea, that I get a solution, oke. But then 
I find, that a lot work has been done. I'm asking myself, 
if it can be done on a shorter way and maybe easier way? 
And then a solution of two A4-pages can change into a solution
of just two lines and then thinking yourselves, why I have 
not seen that before? I can only answer "You never know". 
Keep in mind, "nice" solutions, what is "nice"? Is there 
ever asked to you to give a "nice" solution? Often there 
are several ways to come to the solution. Keep also in mind,
that two people can have the same solution, but only 
written on a different way. Or they have both a solution 
of a given problem and if you look to these solutions, 
they look very different, but both they are good. 
Maybe the problem has more then one solution? Keep care.

Important is that you ask yourselve some questions:
1) Where is the question going about?
2) What can I use to solve it?
3) The lecture just given, can I use something of that?
4) Have I read the whole exercise? Often you only look 
to what you think, there has to be done. Maybe there is 
written at the first line of the exercise "This problem 
can not be solved." and you are searching for a solution?
5) .....

Let's go and see if everything goes well, 
but always try, without trying you achieve nothing,

Rene' (van Hassel)