Color of last ball II Puzzle-Asked in interviews.

Question:

You have 20 blue balls and 13 red balls in a bag.
You put your hand in and remove 2 at a time.

If they’re of the same color, you add a blue ball to the bag.

If they’re of different colors, you add a red ball to the bag.

Assume you have a big supply of blue & red balls for this purpose.

Solution: Red Ball

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