Inductive hypothesis: Assume that the statement is true for some arbitrary natural number k, i.e., 2(1) + 4(1) + 6 + ... + (2k) = k(k+2).
Inductive step: We need to show that the statement is also true for k+1, i.e., 2(1) + 4(1) + 6 + ... + (2k) + (2(k+1)) =
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