Problem about logic A Mathematics lecturer can’t find a nice exercise for the final exam paper of his course. Then he makes up his mind and gives the following one-line exercise:
Write an exercise you think suitable for this exam, and solve it.
When he corrects the papers, he finds out that - just under the text of this exercise - one of his students has worked out the following two lines:
Write an exercise you think suitable for this exam, and solve it.
Write an exercise you think suitable for this exam, and solve it.
Now, the question is:
Is this a correct answer to the exercise?
If it’s not, modify it so that it becomes a correct answer.
I think it should be modified, because to solve the first sentence i need to solve the second and then i should solve the third, but to solve the third i need to write another exercise and solve it, so he should write infinite lines. 
But i don't think this could be the correct answer.
So i don't know how to solve it, also there is  more than one answer

My solution would be:
Excercise: Write an exercise you think suitable for this exam, and solve it. Solution: see Excercise and its Solution.
Then it is recursive in its definition. It relies on self reference and the lecturer considering the question as posed a suitable question. Logically this must be, since they posed it. And lecturers don't pose unsuitable questions (if economists can assume rational behavior, so can I).
