Determine all possible positive integer values of n that satisfy this equation:

Σ

j=n j=1

(x+j-1) (x+j) = 10*n

whenever x is an integer.

Note: For a desired value of n, the above equation holds true for at least one value of x.

(In reply to re: Possible solution by brianjn)

Brian,

Please see Daniel's version which seems to explain it very clearly.

Edited on February 23, 2011, 3:07 pm

Posted by broll on 2011-02-23 07:44:24