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Blue and Red ball puzzle!
You are sitting on a mountain of blue and red balls. You have a bag filled with exactly 20 blue and 13 red balls. You decide to play a game and here are the rules.
You will remove two balls from the bag. If they are the same colour, you will add a blue ball into the bag. If they are different colours, you will add a red ball into the bag. Please note that, because you are not placing the two test balls back into the bag, you will always be losing a ball every turn so, eventually, you will be down to a single ball.
Now, what will be the colour of this last ball?
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