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give T(n)=T(n-1)+2^n use substituiton method prove that it’s big oh O(n^2)

give T(n)=T(n-1)+2^n use substituiton method prove that it’s big oh O(n^2)
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Proof using subsitution method given below

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T(n) = T(n-1) + n , O(n­2)
T(n) = T(n-1) + n , O(n­2)
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