At 18:22 21/06/2013 0500, Dale Erwin wrote:
>I realize that a variable can take any value, but some mathematical
>functions limit the possible values.
Oh, indeed!
>... I thought this particular function was stated as Sigma 1 to n =
>n*(n + 1) / 2 (where n > 1).
It also works for n = 1, so n >= 1 is probably better.
>You don't really have a series if n is not > 1.
Indeed: the original question asked to include numbers (i.e., in this
case, integers) from 1 up to n. You can't really count up from 1 to
0, or to any fractional value, or to negative values.
>If you did allow the series to run backward (from 1 to 0) you would
>get Sigma 1 to 0 = 0 * 1 / 2 which evaluates to 0.
Depending on how you defined your function, you could choose to
include that as a permitted result. Apparently that's what the
questioner wants.
Brian Barker

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