$2+4+6=3(3+1)$, $2+4+6+...+ 2(k+1)=(k+1)(k+2)$.
Work Step by Step
Following the previous statements, we have: If $n=3$, the statement is $2+4+6=3(3+1)$ If $n=k+1$, the statement is $2+4+6+...+ 2(k+1)=(k+1)(k+2)$.
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