What is the second step to prove that S, = 2+ 22 + 2' +...+ 2* = 2(2* – 1)? Show that S, is valid for n = k + 2. Assume that S, is valid for n = k and prove that S, is valid for n = k + 1. Show that S, is valid for n = k. Verify that S, is valid for n = 1.

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