Question

I need an answer how to define this formula in python.

(1+ x)ex =1+
2x
1!
+
3x2
2!
+
4x3
3!
+
5x4
4!
+

Answer 1

def fact(n): #calculate factorial
f=1
for i in range(n,1,-1):
f=f*i
return f
n=int(input())
x=int(input())
s=1
for i in range(1,n+1):
s=s+((i+1)*(x**i)*fact(i))
print(s)

Output

4

2

2141