An American-style option allows for early exercise; therefore, it must be worth more than the equivalent European option. To price the option with the binomial, we only need to modify the non-terminal nodes so that their value equals Max (expected discounted value, intrinsic value).
David's XLS is here: https://trtl.bz/2DcTVeo
David's XLS is here: https://trtl.bz/2DcTVeo
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