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K changed from 735 in a) to 753 in b). Not a big deal. Good stuff.
Thanks for the comment oliversnow1. Even though the final answers are correct I also keep saying "36cm" when I should be saying "3.6cm", even though things are written correctly. I've added this video to the list of retakes after the 7th Edition videos are done.
Best wishes,
Mr. Dychko