Need some help
Name:
Anonymous
2007-10-16 22:30
Need an expression for Sn where
Sn = a1 + a2 + a3 + ... + an
and
an = n(n+1)
Name:
Anonymous
2007-10-16 22:44
n*(n+1)(2n+1)/6 + n(n+1)/2
Name:
Anonymous
2007-10-16 22:52
Appears to work, thanks. How did you figure it out?
Name:
Anonymous
2007-10-16 22:53
It turns into the sum from i=1 to n of n^2 + n
The sum from i = 1 to n of n^2 is n*(n+1)(2n+1)/6
The sum from i = 1 to n of n is n(n+1)/2
Google summation formulas for a list of formulas for the sum from i = 1 to n of n^a
Name:
Anonymous
2007-10-16 22:56
Thank you.
Name:
Anonymous
2007-10-16 22:57
No problem
Name:
Anonymous
2007-10-17 0:40
Kind Anonymous? In MY /sci/?
OP: gb2/high_school/, at your age I was doing HUGE infinite series that even Ramanujan couldn't comphrend.
Name:
Anonymous
2007-10-17 22:42
FAULHABER'S FORMULA