Recursive calls issue

how to calculate the number of recursive calls for nth fibonacci number?please explain in detail also derive the formula for that.please do not give a link ofd some other website.

For calculating the number of recursive call, you can draw the recursion tree for some small number and from that you can deduce that it will 2^n.
And regarding the proof of fibonacci numbers as you have said that you don’t want to see any link and it will be the same thing if i will do, so i just suggest you through some good mathematical derivation by googling you can do that.

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