with numbers 1, 2, 3, ... are put in
a box in a particular order.
One minute before noon numbers from
1 till 10 are put and a number 1 is
1/2 minute before noon numbers from
11 till 20 are put and a number 2 is
1/3 minute before noon numbers from
21 till 30 are put and a number 3 is
And so on.
How many numbers are in the
box at noon?
We can consider any number, for example
number N. It will be taken back at N-th
operation. Let us look at the set:
is an "empty" set, and from
mathematical point of view there is