A quick follow up to the last one.
You have the same setup - 100 coins encased in plastic, you are blindfolded. Only this time, there are 10 tails. Can you divide the coins into two groups so that they each have the same number of tails?
And now, generalizing: What if there are n tails at the start. Can you always divide the coins into two groups so that they have the same number of tails?
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