OT:Re: No IRC in Kopete for KDE 4.1?

[Dotan Cohen]

2008/8/30 Derek Broughton <news at pointerstop.ca>:
> Dotan Cohen wrote:
>
>> 2008/8/30 Derek Broughton <news at pointerstop.ca>:
>>> Factorial.  Like, I'm talking to all my sibs and both parents, and
>>> they're all doing the same (but n! rather than n**n, because if I talk to
>>> my brother and he talks to me, that's usually only one conversation :-)
>>> ).
>>
>> That's not factorial, that's the sum of 1 to (n-1) conversations,
>> which works out to (n^2)/2.
>
> Damn!  You're right, and my expensive Math education is doing me no good at
> all (I _still_ don't know why I went to school for a Math degree to get
> into computers...)

Actually, I'm not. It should have been n*(n+1)/2. Young Gauss would be mad.

I knew as I posted that I had an error, because n^2 would be odd for
an odd n, and thus indivisible evenly by 2. Buy I had to hit that Send
button to find the mistake......

A = n/2(a1+an) according to young Gauss (I'm sure you know the story).

-- 
Dotan Cohen

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