- To print sum of 1 to N
User Input: 10
Output:
Sum of 1 to 10 : 55
n=int(input("Enter last number :"))
print("sum of 1 to ",n," : ", int((n*(n+1))/2))
Enter last number : 10 Sum of 1 to 10 : 55Program
We are using the formula of sum of natural numbers (1 to N)
(N*(N+1))/2 // N is the last number
Concept