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Originally Posted by Mike Betts
Your answer is right but the explanation is wrong:
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ok, I was in a hurry: 32 / 2 = 16, not 18
32 heads and no tails
31 heads and 1 tail...
down to 18 tails and 14 heads, it comes out the same - no matter which 32 you grab
for the question with infinity coins, you grab 20 and flip them, and make that your second pile
I want to know, how can you tell only 20 were originally tails up, if there is an infinite number of coins in the room?