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Recursionmedium
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A recursive function is defined as f(n)=f(n−1)+2n−1f(n) = f(n-1) + 2n - 1f(n)=f(n−1)+2n−1 with f(0)=0f(0) = 0f(0)=0. Which of the following is the correct closed-form expression for f(n)f(n)f(n)?