Rule of 69

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In this video we derive the rule of 69 using logarithms. I like it because it shows a nice real world use case for logarithms.
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Yes ofcourse 69 is the only number with practical uses

gwhawkeye
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69, double, squish, top, bottom. Carefully chosen words. Now that's genuinely exciting

ngneerin
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Isn't this known as the rule of 72.

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