hey does anyone know how to solve this? Prove 1x2+2x3+3x4+...+n(n+1)=1/3n(n+1)(n+2) for each n of the element of natural numbers. x = multiplication thanks...
Follow Math Help Forum on Facebook and Google+
Hello, You're asked the sum : Do you know the general formulae for these sums ? You should have learnt it...i think ^^
Hello, TheMikego! Prove: . How about an inductive proof? We have: . Verify Assume Add to both sides: . . The right side is: . . . We have established . . . The inductive proof is complete.
View Tag Cloud