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Update Recursion.md

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@ -85,8 +85,10 @@ def subsets(A, i, aux):
no_take = subsets(A, i+1, aux) # Case 2 no_take = subsets(A, i+1, aux) # Case 2
``` ```
Draw recursion Tree.
![IMG_0036](https://user-images.githubusercontent.com/35702912/66323471-7a914e80-e941-11e9-84a9-11a333ac4f77.jpg) <img src="https://user-images.githubusercontent.com/35702912/66323471-7a914e80-e941-11e9-84a9-11a333ac4f77.jpg" width="400"
/>
How many leaf nodes? $2^n$ - one for each subset How many leaf nodes? $2^n$ - one for each subset
How many total nodes? $2^{n+1} - 1$ How many total nodes? $2^{n+1} - 1$