how to write a(–n)+b(n–) in python plz help
i-- or i++ does not work in python.
You can do this → i+=1 or i-=1. Read this you will understand. 
In python we do for i in range(0,n,stepsize) instead of for(i=0;i<n;i++) like other languages. Here stepsize is 1 by default if you do not mention.
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a(n-1)+b(n-1)
n=n-2
This should give the same result!!
Also if u are trying out the problem that u had earlier posted…it is most probably calculating 2^n…u deleted the post before I could reply…
where do i put n-=2 then
still shows segmentation fault