what’s your favourite number

Question: what's your favourite number
- Keywords:
  number
Asked by sam to Adam, Eloise, Iona, Jarrod, Yip on 14 Jun 2016. This question was also asked by Nigel Farrage.
- Eloise Taysom answered on 14 Jun 2016:
  
  2!
- Iona Strawson answered on 14 Jun 2016:
  
  7!
- Man Hang Yip answered on 15 Jun 2016:
  
  19
- Jarrod Hart answered on 22 Jun 2016:
  
  There is a number, which, when you times it by itself, gives the answer ‘-1’.
  Can you figure out what it is?
  It is my favourite.
  
  In distant second, we have:
  2.7182818284590452353602874713527
  For those intrigued as to why, I wrote a long blog article all about it here:
  http://theprovincialscientist.com/?p=1902

Jarrod commented on 22 Jun 2016:

PS 7, or 7! – not the same to a mathematician 😉

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Question: what's your favourite number