point(s) possible Use mathematical induction to prove the statement is true for every positive integer n. 6+ 12+ 18+ ... + 6n= 3n(n +1) What is the first step in a mathematical induction proof? Question Viewer O Show that S, is true. Show that So is true. O Show that Sky is true. O Show that S, is true. Let S, be the statement 6 + 12 + 18 + ... + 6n =3n(n + 1). Write the statement S, S (Do not simplify.) Simplify S, on the right