Maths on the Back of an Envelope : Clever ways to (roughly) calculate anything
Rob Eastaway
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Format: eBook (EPUB)
Mindbenders and Brainteasers : 100 Maddening Mindbenders and Curious Conundrums
Rob Eastaway
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Format: eBook (EPUB)
100 Maddening Mindbending Puzzles : Logic problems, maths conundrums and word games
Rob Eastaway
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Format: eBook (EPUB)