Jeffrey Dik wrote:
> Heh, I couldn't figure out how to get a negative number using double, 
> halve,
> and add_two from the number 1.  

You are correct Jeffrey, see the matrix in my last reply. Starting with 
a positive number, you can only reach positive numbers.

This quiz should be interesting enough, using only positive numbers, as 
any positive number can be reached from any positive number.

Christer Nilsson

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