Prove by PMI 3 . 2 2 + 3 2 . 2 3 + . . . . . . . . . . . + 3 n 2 n + 1 = 12 5 6 n - 1 prove Share with your friends Share 0 Rishabh Mittal answered this Dear Student , Here is the similar link for your query : https://www.meritnation.com/ask-answer/question/prove-2-32-22-33-23-34-2n-3-8/principle-of-mathematical-induction/11573531 We hope the above link will help you in clearing the doubt . Regards 0 View Full Answer