Natural Sum
The picture illustrates the sum 1 + 2 + 3 + 4 = (4 x 5)/2. Prove the general formula for the sum of the first n natural numbers and the formula for the sum of the cubes of the first n natural numbers.
Problem
Image
The picture illustrates the sum
Teachers' Resources
Possible support
Try the problems
More Sequences and Series,
and OK Now Prove It
Possible extension
Picture Story,
Telescoping Series
and Seriesly
Read the article Proof by Induction.