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Sum (expression) = 10*n (Posted on 2011-02-22) Difficulty: 3 of 5
Determine all possible positive integer values of n that satisfy this equation:
Σj=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.

See The Solution Submitted by K Sengupta    
Rating: 3.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Possible solution | Comment 4 of 5 |
(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

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