Python Program:

- To print sum of 1 to N

Example:

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))

Output:

  Enter last number : 10
  Sum of 1 to 10 : 55
Program
number

We are using the formula of sum of natural numbers (1 to N)

(N*(N+1))/2  // N is the last number
Concept

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