An alchemist suggests that you choose two portions of magic powder. There are two kinds of powder and nine available portions. All portions look the same.
If you choose two portions of the same kind, you get a poison.
If you mix two different kinds of magic powder, you get an elixir of life, also known as an elixir of immortality.

He said that the probability of being immortal or dead is fifty-fifty.

What are the numbers of portions of the two different magic powders?