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Assume there are 10⁸⁰ 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?

Solution