Is there anyone out there who could assist with a probability formula?

Here is a quick sample...

I have numbers ranging from 1 to 100.
I have documented history of 800 "pick a number" from the above range.

For example, history looks like this:

1 picked 9 times, 2 picked 23 times, 3 picked 14 times, 4 picked 42 times...

How could I create a formula to determine the probability of numbers chosen
to be chosen again? Is it even possible?

Thanx.