A bag contains four red marbles and four blue marbles. You randomly pick a marble without returning the marbles to the bag. Both marbles are red.

I suppose this is in reference to the chance?

The chance of choosing either red or blue marbles is 50/50 considering that there if four of each type in the bag.

The person chose 2 times, and each time go a red marble. The chance of choosing either is still 50% and they are both equally likely to get chosen.