If the chances are 1 in 5 of choosing a black, the person in the...

If the chances are 1 in 5 of choosing a black, the person in the last 4 or 3 or 2 in the queue surely the odds cannot continue to be 1 in 5.

I believe the chances are the same for everyone to choose a black marble, its just that my workmate suggested the last in the queue theory to me that got me thinking, and I can't resolve it in my head.

Thanks for the responses.