## A googol particles |
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Assume there are 10^{80} particles in the observable universe, and imagine you have 100 quintillions of such universes.

If you write the positive integers in a long sequence like this:

12345678910111213141516171819202122232425...

and if you write one digit on each particle of the above mentioned 100 quintillion universes, what digit would you then write on the last particle of the last universe?