For the inductive hypothesis we assume that P(k) is true; that is, we assume that k3 -k is divisible by 3. To complete the inductive step, we must show that when we assume the inductive hypothesis, it follows that P(k + 1), the statement that (k + 1)3 -(k + 1) is divisible by 3, is also true. That is, we must show that (k + 1)3 -(k + I) is divisible by 3. Note that (