If a, b, c are in AP, prove that a3 + 4b3 + c3 = 3b ( a2 + c2 ). Share with your friends Share 1 Varun.Rawat answered this Refer the following link : https://www.meritnation.com/ask-answer/question/if-a-b-c-are-in-ap-then-a3-4b3-c3-is-equal-to/arithmetic-progressions/1724989 1 View Full Answer