Quote:
Originally Posted by Daithi
Just to be clear, you could tell me that there are 5 coins heads-up and I will be able to place them into 2 stacks that have the same number of heads-up coins?
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Quote:
Originally Posted by issybird
I can get partway there. If there's an odd number of heads, you have to fix that first. If it's an odd number of heads in an odd number of coins, then turn all the coins over. If it's an odd number of heads in an even number of coins, you turn over one coin.
But I haven't figured out how to stack them yet.
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Yes, if I was told that there were five coins head-up, I would be able to stack the coins so that there were the same number of heads up in each stack.
There's no need to turn the whole stack over for an odd number of heads.
There is a simple way to do this, that works for any number of heads and any number of coins in the stack. (Well, there must be at least two coins in the stack, of course. It would be a bit difficult to make two stacks out of one coin!).
Hint: I didn't say that the two stacks had to have the same number of coins in them, just the same number of coins heads-up.