Add a sequence of #'s n+n-1 to n

T

Tony

I am looking for a formula that is similiar to factorial
(eg 10!) but is for addition.

I want to use this in excel but can not find the
formula. It would be (n + n-1) to the nth I believe.

thank you
 
A

Alan Beban

Tony said:
I am looking for a formula that is similiar to factorial
(eg 10!) but is for addition.

I want to use this in excel but can not find the
formula. It would be (n + n-1) to the nth I believe.

thank you
Click to expand...
n*(n+1)/2

Alan Beban
 
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