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Order of Growth 2: - answer

For N = 2k

 N + N / 2 + N / 22 + ... + N / 2k =
        2k + 2k - 1 + ... + 1 =
        1 + 2 + 4 + 8 + ... + N
     

This sum is 2N - 1

So the growth is ~ 2N



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