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.

i m at a bit of a loss here.. how does one prove that the nth odd number is given by 2n-1 .. it is how odd and even numbers are defined .. the nth even number is given by 2n and the nth odd one is given by 2n-1

Posted by anand on 2003-10-17 14:31:01