Solving Facebook's raining in Seattle interview question

People often email me that my videos helped them get a tech or finance job, which is really awesome, and I want to do more to help! So in this video I'm sharing a problem based on an interview question asked at Facebook.
Source
www.glassdoor....
(Note: I re-uploaded this video with corrections. The original calculations were correct but I used the wrong notation. Since I want everyone to ace their job interview, I posted a correction as soon as possible! Thanks to everyone who pointed out the mistake! Original: • How To Solve Facebook'... )
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