ANSWERS: 2
  • not that i know of. of course you can always use the formula 1 + 2 + 3 + ... + n = (n * (n + 1)) / 2
  • There is something similar, you can use the sigma notation to represent 1+2+...+n There is an example here: http://mathcentral.uregina.ca/QQ/database/QQ.09.07/h/jamelia1.html But you don't need a special notation because the sum is easy to work out, 1+2+3+...+n = (n(n+1))/2 and the formula is simple. The factorial hasn't got a simple closed formula.

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