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**What is statement and verification of statement**

**What is Mathematical statements? Explain with the example.**

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**Second principal of mathematical induction**

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**Prove by the principle of mathematical induction that for all natural numbers n; `n^2+n` is even natural no.**

**Prove by the principle of mathematical induction that for all natural numbers n; `1+3+3^2+.....+3^(n-1)=(3^n-1)/2`.**