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21 is the Coolest Number... Here's Why! 🤯 | Mind-Blowing Math Facts #shorts
Did you know that 21 is far more interesting than it looks? 🤯 In this YouTube Short, discover why 21 is one of the coolest numbers in mathematics! Learn how it's the sum of the first six natural numbers, why it's a triangular number, how the famous triangular number formula is derived, and why 21 is the first Blum Integer—a special number ...
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