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Use Mathematical Induction to Prove That for All Positive Integers $n, 5+7+9+11+\cdots+(2 n+3)=n^{2}+4 n$

Question 11

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Use mathematical induction to prove that for all positive integers $n, 5+7+9+11+\cdots+(2 n+3)=n^{2}+4 n$ .

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