Olympiad level counting: How many subsets of {1,…,2000} have a sum divisible by 5?
By 3Blue1BrownFrom boclips.com
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Timestamps 0:00 - Puzzle statement and motivation 4:31 - Simpler example 6:51 - The generating function 11:52 - Evaluation tricks 17:24 - Roots of unity 26:31 - Recap and final trick 30:13 - Takeaways
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Explainer
Mathematics
Advanced Secondary
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