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An Odd Pyramid (Posted on 2003-10-14) Difficulty: 3 of 5
Consider the numerical pyramid below, formed by simply putting down the series of odd numbers into a pyramid.
           1
         3   5
       7   9   11
    13  15  17   19
      . . .
Find a formula for the sum of the numbers in the nth row, and prove it.

See The Solution Submitted by DJ    
Rating: 4.1667 (12 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: solution | Comment 2 of 21 |
(In reply to solution by SilverKnight)

Don't we need to prove that the first element in each row is indeed n² - n + 1?


  Posted by Charlie on 2003-10-14 14:17:41

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