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The mistake that I was more annoyed at was when the show said that ≡ meant "equal by definition".
During my maths degree I found that different lecturers, books and countries didn't have a standard for this (as http://en.wikipedia.org/wiki/Table_of_mathematical_symbols shows).
As for (2n+1)pi, I guess this is true but idea is that the team are looking for the connection between the clues so the answer they should give is that they are all things that *can equal* pi.
I'm glad you're watching the show. I do my best to give maths questins a fair crack of the whip as I feel it's a subject that's under-represented (or, worse, badly represented) in other quiz shows.
Kind regards,
David
OC Question Setter/Editor
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