Question

Python program to find sum of first n natural numbers. Give me 2-3 approach. Plz.

Please help me and I need friends. ​

Answer 1

Required Answer:-

Question:

• Write a Python program to find sum of first n natural numbers.

Solution:

This is an easy question. You can try all these approaches.

1. Approach 1. (Using for loop)

n=int(input("Enter n - "))

s=0

for i in range(1,n+1):

s+=i

print("Sum of first ",n," terms is: ",s)

2. Approach 2 (Using while loop)

n=int(input("Enter n - "))

s,i=0,1

while i<=n:

s+=i

i+=1

print("Sum of first ",n," terms is: ",s)

3. Approach 3 (In one line)

print("Sum is: ",sum(i for i in range(0,int(input("Enter n: "))+1)))

Logic:

We will take n as input. n means the number of terms for the sum. For example, n=10,11..

Now, we will create a loop that runs n times. After each iteration, the value of the loop variable is added to the sum variable. Time to print.

Output is attached.