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Prove by the principle of mathematical i...

Prove by the principle of mathematical induction that for all `n in N` : `1+4+7++(3n-2)=1/2n(3n-1)`

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Here `P(n) Rightarrow P(n+1) and P(4)` is true, therefore, by the principle of mathematical indcution, P(n) is true for all `n ge 4`.
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