Last Puzzles (Logic brain teaser)

There is a box in which there are 20 black chocolates and 16 white chocolates. You take out two chocolates at one time. If both are of same type, you add a black chocolate otherwise you add a white chocolate. You keep repeating like this till there is only one chocolate left in the box. Which type of chocolate will be left in the last? Also, suppose you begin the same process with 100 black and 93 white chocolates. Which chocolate will be left at last then?

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