A frog is at the bottom of a well just shy of ten feet deep. He can jump three feet up, but the walls of the well are slippery, so he slides back two feet each time. How many jumps does it take to get out of the well? On Sat, Nov 11, 2017 at 6:06 AM, James Propp <jamespropp@gmail.com> wrote:
Anyone have a favorite puzzle in which miscounting plays a role?
My favorite is the classic bookworm puzzle (see https://math.stackexchange.com/questions/1271651/how-is-this-true-bookworm-p... ).
Another example: A man was born in 50 BC and died on the same day in 50 AD. How old was he when he died?
I'm especially interested in puzzles that lend themselves to solvers committing fencepost errors, and off-by-one errors more generally.
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