In this video I show you how to use mathematical induction to prove the sum of the series for ∑r.

The method of induction:

  • Start by proving that it is true for n=1, then assume true for n=k and prove that it is true for n=k+1. If so it must be true for all positive integer values of n.
Mathematical Induction - Proof of ∑r=n(n+1)/2 | ExamSolutions - youtube Video