### Problem 1: Sum of Natural Numbers

**Question:** Write a program to find the sum of the first `n`

natural numbers.

**Example Input:**`n = 5`

**Example Output:**`15`

**Solution:**

### Problem 2: Factorial of a Number

**Question:** Write a program to find the factorial of a number `n`

.

**Example Input:**`n = 4`

**Example Output:**`24`

### Problem 3: Print Multiplication Table

**Question:** Write a program to print the multiplication table of a number `n`

.

### Problem 4: Reverse a String

**Question:** Write a program to reverse a given string.

### Problem 5: Count Digits in a Number

**Question:** Write a program to count the number of digits in a number `n`

.

**Example Input:**`n = 12345`

**Example Output:**`5`

### Problem 6: Fibonacci Sequence

**Question:** Write a program to print the first `n`

terms of the Fibonacci sequence.

**Example Input:**`n = 5`

**Example Output:**`0 1 1 2 3`

### Problem 7: Sum of Digits

**Question:** Write a program to find the sum of digits of a number `n`

.

**Example Input:**`n = 123`

**Example Output:**`6`

### Problem 8: Palindrome Check

**Question:** Write a program to check if a given string is a palindrome.

### Problem 9: Find the Largest Number

**Question:** Write a program to find the largest number in a list.

**Example Input:**`lst = [3, 1, 4, 1, 5, 9]`

**Example Output:**`9`

### Problem 10: Find the Second Largest Number

**Question:** Write a program to find the second largest number in a list.

**Example Input:**`lst = [3, 1, 4, 1, 5, 9]`

**Example Output:**`5`

### Problem 11: Count Vowels in a String

**Question:** Write a program to count the number of vowels in a given string.

### Problem 12: Sum of Even Numbers

**Question:** Write a program to find the sum of even numbers from 1 to `n`

.

**Example Input:**`n = 10`

**Example Output:**`30`

### Problem 13: Count Words in a String

**Question:** Write a program to count the number of words in a given string.