1. Let Phi) he the statement that 13 + 23 + ...... n2 = n{n + 1][2n + HIE for the positive integer n. a} What is the statement PH}? 1]] Show that Fifi] is true, completing the basis step of the proof. c} What is the inductive hypothesis? d] What do you need to prove in the inductive step? e] Complete the inductive step, identifying where you use the inductive hypothesis f} Explain why these steps show that this formula is true whenever n is a positive integer