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Number of seats in the Maracana Stadium (Rio Olympics) (90,000 ) is 250 x Number of ways a travelling salesman can visit six towns (and return home) (360 )
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Height of an ostrich (2.7 m)
If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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