I first read this problem in a book a few hours ago. After going to bed I began thinking about it & believed I had solved it. (Flip the biggest one to the top and then flip the whole stack) The final flip would place two pancakes at once. I got up & wrote down a formula that I believed would work.. 2n-2= maximum flips. I logged on and found your site. I know that my theory is correct, but is my formula?

Regards,
Don

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