Question

Sum of the series

Write a program to find the sum

S of the series where S = x - x^3 + x^5 + ....... upto N terms.

Sample Input 1

2

5

Sample Output 1

410

to solve this approch

if i value is even:

result = summation of the term value and then added to the result

else :

result = Subtraction of the term value and then added to the result

Answer 1

x = int(input())
n = int(input())
sign = 1
buff = 0
pow = 1
for i in range(n):
	buff += sign*x**pow
	sign *= -1
	pow += 2
print(buff)