1. Write a recursive python function to calculate sum of first N natural numbers
2. Write a recursive python function to calculate sum of first N odd natural numbers
3. Write a recursive python function to calculate sum of first N even natural numbers
4. Write a recursive python function to calculate sum of squares of first N natural numbers
5. Write a recursive python function to calculate sum of cubes of first N natural numbers
6. Write a recursive python function to calculate the factorial of a number.
7. Write a recursive python function to calculate sum of the digits of a given number
8. Write a recursive python function to print binary of a given decimal number.
9. Write a recursive python function to print octal of a given decimal number
10. Write a recursive python function to find the Nth term of the Fibonacci series.
