3.6 +6.9+9.12+....+3n(3n+3) = 3n(n+1) (n+2) Share with your friends Share 7 Anushka answered this Prove by induction that 3^n>n for any natural number n. 3 View Full Answer Sourav answered this Que 2 -6 Mohd Rumaan answered this Thus lga=rha -5