Given a natural number n, the task is to write a Python program to first find the sum of first n natural numbers and then print each step as a pattern.
Input: 5 Output: 1 = 1 1 + 2 = 3 1 + 2 + 3 = 6 1 + 2 + 3 + 4 = 10 1 + 2 + 3 + 4 + 5 = 15 Input: 10 Output: 1 = 1 1 + 2 = 3 1 + 2 + 3 = 6 1 + 2 + 3 + 4 = 10 1 + 2 + 3 + 4 + 5 = 15 1 + 2 + 3 + 4 + 5 + 6 = 21 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
Approach:
Program:
# Inputing Natural Number number = int(input("Enter the Natural Number: ")) # j ranges from 1 to n for j in range(1, number+1): # Initializing List a = [] # i loop ranges from 1 to j for i in range(1, j+1): print(i, sep=" ", end=" ") if(i < j): print("+", sep=" ", end=" ") a.append(i) print("=", sum(a)) print()
Output:
Enter the Natural Number: 5 1 = 1 1 + 2 = 3 1 + 2 + 3 = 6 1 + 2 + 3 + 4 = 10 1 + 2 + 3 + 4 + 5 = 15