There is a jar of 25 white marbles and 50 black marbles.

Yakub removes the marbles according to the following rule:

He picks 2 marbles at random.

If at least one of the marbles is black, then black marble is thrown away and the other marble is placed back in the jar.

If both marbles are white, then they are both thrown away.

If, after some point in time, only one marble is left in the jar, what color is it?

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